Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 28, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	BROWN & BROWN, INC.
Entity Central Index Key	0000079282
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		281,746,279
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock, $0.10 Par Value
Trading Symbol	BRO
Security Exchange Name	NYSE
Entity File Number	001-13619
Entity Incorporation, State or Country Code	FL
Entity Tax Identification Number	59-0864469
Entity Address, Address Line One	220 South Ridgewood Avenue
Entity Address, City or Town	Daytona Beach
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	32114
City Area Code	386
Local Phone Number	252-9601
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES
Commissions and fees	$ 617,363	$ 529,813	$ 1,807,758	$ 1,502,219
Investment income	1,668	719	4,274	2,051
Other income, net	(348)	318	1,150	1,228
Total revenues	618,683	530,850	1,813,182	1,505,498
EXPENSES
Employee compensation and benefits	331,120	268,045	973,567	790,902
Other operating expenses	96,409	83,697	283,242	243,704
(Gain)/loss on disposal	(3,815)	1,106	(4,326)	(1,544)
Amortization	26,272	21,637	78,418	62,961
Depreciation	5,815	5,259	17,516	16,410
Interest	16,314	8,963	47,805	28,686
Change in estimated acquisition earn-out payables	(5,270)	(357)	(6,920)	2,528
Total expenses	466,845	388,350	1,389,302	1,143,647
Income before income taxes	151,838	142,500	423,880	361,851
Income taxes	36,332	36,447	101,885	91,048
Net income	$ 115,506	$ 106,053	$ 321,995	$ 270,803
Net income per share:
Basic (in dollars per share)	$ 0.41	$ 0.38	$ 1.14	$ 0.98
Diluted (in dollars per share)	0.41	0.38	1.14	0.96
Dividends declared per share (in dollars per share)	$ 0.080	$ 0.075	$ 0.240	$ 0.225

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 497,510	$ 438,961
Restricted cash and investments	377,085	338,635
Short-term investments	9,935	12,868
Premiums, commissions and fees receivable	895,612	844,815
Reinsurance recoverable	309,787	65,396
Prepaid reinsurance premiums	383,565	337,920
Other current assets	133,443	128,716
Total current assets	2,606,937	2,167,311
Fixed assets, net	128,889	100,395
Operating lease assets	193,419	0
Goodwill	3,702,265	3,432,786
Amortizable intangible assets, net	923,418	898,807
Investments	28,137	17,394
Other assets	97,599	71,975
Total assets	7,680,664	6,688,668
Current Liabilities:
Premiums payable to insurance companies	906,136	857,559
Losses and loss adjustment reserve	309,787	65,212
Unearned premiums	383,565	337,920
Premium deposits and credits due customers	118,350	105,640
Accounts payable	103,920	87,345
Accrued expenses and other liabilities	272,166	279,310
Current portion of long-term debt	55,000	50,000
Total current liabilities	2,148,924	1,782,986
Long-term debt less unamortized discount and debt issuance costs	1,513,560	1,456,990
Operating lease liabilities	177,097	0
Deferred income taxes, net	322,024	315,732
Other liabilities	204,536	132,392
Shareholders’ Equity:
Common stock, par value $0.10 per share; authorized 560,000 shares; issued 297,136 shares and outstanding 282,498 shares at 2019, issued 293,380 shares and outstanding 279,583 shares at 2018 - in thousands.	29,714	29,338
Additional paid-in capital	703,949	615,180
Treasury stock, at cost at 14,638 shares at 2019 and 13,797 shares at 2018, respectively - in thousands	(507,314)	(477,572)
Retained earnings	3,088,174	2,833,622
Total shareholders’ equity	3,314,523	3,000,568
Total liabilities and shareholders’ equity	$ 7,680,664	$ 6,688,668

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	560,000,000	560,000,000
Common stock, shares issued (in shares)	297,136,000	293,380,000
Common stock, shares outstanding (in shares)	282,498,000	279,583,000
Treasury stock shares (in shares)	14,638,000	13,797,000

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings
Beginning Balance, Value at Dec. 31, 2017	$ 2,582,699	$ 28,689	$ 483,733	$ (386,322)	$ 2,456,599
Beginning Balance, Shares at Dec. 31, 2017		286,895
Adoption of Topic 606 at January 1, 2018 (Accounting Standards Update 2014-09) at Dec. 31, 2017	117,515				117,515
Beginning Balance, Value at Dec. 31, 2017	2,700,214	$ 28,689	483,733	(386,322)	2,574,114
Net income	90,828				90,828
Net unrealized holding (loss) gain on available-for- sale securities	(132)		(77)		(55)
Common stock issued for employee stock benefit plans	(321)	$ 6	(327)
Common stock issued for employee stock benefit plans, Shares		53
Purchase of treasury stock			11,250	(11,250)
Common stock issued to directors	700	$ 1	699
Common stock issued to directors, Shares		13
Cash dividends paid	(20,696)				(20,696)
Ending Balance, Value at Mar. 31, 2018	2,770,593	$ 28,696	495,278	(397,572)	2,644,191
Ending Balance, Shares at Mar. 31, 2018		286,961
Beginning Balance, Value at Dec. 31, 2017	2,582,699	$ 28,689	483,733	(386,322)	2,456,599
Beginning Balance, Shares at Dec. 31, 2017		286,895
Adoption of Topic 606 at January 1, 2018 (Accounting Standards Update 2014-09) at Dec. 31, 2017	117,515				117,515
Beginning Balance, Value at Dec. 31, 2017	2,700,214	$ 28,689	483,733	(386,322)	2,574,114
Net income	270,803
Ending Balance, Value at Sep. 30, 2018	2,939,408	$ 29,011	525,465	(397,572)	2,782,504
Ending Balance, Shares at Sep. 30, 2018		290,109
Beginning Balance, Value at Mar. 31, 2018	2,770,593	$ 28,696	495,278	(397,572)	2,644,191
Beginning Balance, Shares at Mar. 31, 2018		286,961
Net income	73,922				73,922
Net unrealized holding (loss) gain on available-for- sale securities	(29)		(27)		(2)
Common stock issued for employee stock benefit plans	7,711	$ 12	7,699
Common stock issued for employee stock benefit plans, Shares		123
Cash dividends paid	(20,715)				(20,715)
Ending Balance, Value at Jun. 30, 2018	2,831,482	$ 28,708	502,950	(397,572)	2,697,396
Ending Balance, Shares at Jun. 30, 2018		287,084
Net income	106,053				106,053
Net unrealized holding (loss) gain on available-for- sale securities	(68)		(68)
Common stock issued for employee stock benefit plans	22,886	$ 303	22,583
Common stock issued for employee stock benefit plans, Shares		3,025
Cash dividends paid	(20,945)				(20,945)
Ending Balance, Value at Sep. 30, 2018	2,939,408	$ 29,011	525,465	(397,572)	2,782,504
Ending Balance, Shares at Sep. 30, 2018		290,109
Beginning Balance, Value at Dec. 31, 2018	$ 3,000,568	$ 29,338	615,180	(477,572)	2,833,622
Beginning Balance, Shares at Dec. 31, 2018	279,583	293,380
Net income	$ 113,896				113,896
Net unrealized holding (loss) gain on available-for- sale securities	106		106
Common stock issued for employee stock benefit plans	6,209	$ 246	5,963
Common stock issued for employee stock benefit plans, Shares		2,465
Cash dividends paid	(22,348)				(22,348)
Ending Balance, Value at Mar. 31, 2019	3,098,431	$ 29,584	621,249	(477,572)	2,925,170
Ending Balance, Shares at Mar. 31, 2019		295,845
Beginning Balance, Value at Dec. 31, 2018	$ 3,000,568	$ 29,338	615,180	(477,572)	2,833,622
Beginning Balance, Shares at Dec. 31, 2018	279,583	293,380
Net income	$ 321,995
Common stock issued for agency acquisitions	20,000
Ending Balance, Value at Sep. 30, 2019	$ 3,314,523	$ 29,714	703,949	(507,314)	3,088,174
Ending Balance, Shares at Sep. 30, 2019	282,498	297,136
Beginning Balance, Value at Mar. 31, 2019	$ 3,098,431	$ 29,584	621,249	(477,572)	2,925,170
Beginning Balance, Shares at Mar. 31, 2019		295,845
Net income	92,593				92,593
Net unrealized holding (loss) gain on available-for- sale securities	181		205		(24)
Common stock issued for employee stock benefit plans	11,079	$ (5)	11,084
Common stock issued for employee stock benefit plans, Shares		(54)
Purchase of treasury stock			20,000	(20,000)
Common stock issued to directors	880	$ 3	877
Common stock issued to directors, Shares		28
Cash dividends paid	(22,533)				(22,533)
Ending Balance, Value at Jun. 30, 2019	3,180,631	$ 29,582	653,415	(497,572)	2,995,206
Ending Balance, Shares at Jun. 30, 2019		295,819
Net income	115,506				115,506
Net unrealized holding (loss) gain on available-for- sale securities	21		8		13
Common stock issued for employee stock benefit plans	30,658	$ 75	30,583
Common stock issued for employee stock benefit plans, Shares		748
Common stock issued for agency acquisitions	20,000	$ 57	19,943
Common stock issued for agency acquisitions, Shares		569
Purchase of treasury stock	(9,742)			(9,742)
Cash dividends paid	(22,551)				(22,551)
Ending Balance, Value at Sep. 30, 2019	$ 3,314,523	$ 29,714	$ 703,949	$ (507,314)	$ 3,088,174
Ending Balance, Shares at Sep. 30, 2019	282,498	297,136

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 321,995	$ 270,803
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	78,418	62,961
Depreciation	17,516	16,410
Non-cash stock-based compensation	34,679	23,522
Change in estimated acquisition earn-out payables	(6,920)	2,528
Deferred income taxes	6,172	(16,416)
Amortization of debt discount and disposal of deferred financing costs	1,521	1,220
Accretion (amortization) of discounts and premiums, investment	(11)	(4)
Net gain/(loss) on sales of investments, fixed assets and customer accounts	(4,108)	(1,259)
Payments on acquisition earn-outs in excess of original estimated payables	(351)	(11,775)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Premiums, commissions and fees receivable (increase) decrease	(41,078)	(24,560)
Reinsurance recoverables (increase) decrease	(244,391)	379,304
Prepaid reinsurance premiums (increase) decrease	(45,645)	(23,938)
Other assets (increase) decrease	(23,105)	(9,052)
Premiums payable to insurance companies increase (decrease)	43,055	19,179
Premium deposits and credits due customers increase (decrease)	12,335	16,089
Losses and loss adjustment reserve increase (decrease)	244,575	(378,246)
Unearned premiums increase (decrease)	45,645	23,938
Accounts payable increase (decrease)	22,086	27,817
Accrued expenses and other liabilities increase (decrease)	(22,462)	(21,465)
Other liabilities increase (decrease)	7,194	(1,539)
Net cash provided by operating activities	447,120	355,517
Cash flows from investing activities:
Additions to fixed assets	(47,358)	(28,859)
Payments for businesses acquired, net of cash acquired	(288,393)	(254,836)
Proceeds from sales of fixed assets and customer accounts	3,499	3,338
Purchases of investments	(15,769)	(8,897)
Proceeds from sales of investments	8,385	17,551
Net cash used in investing activities	(339,636)	(271,703)
Cash flows from financing activities:
Payments on acquisition earn-outs	(7,514)	(13,337)
Proceeds from long-term debt	350,000
Payments on long-term debt	(36,250)	(115,000)
Deferred debt issuance costs	(3,701)
Borrowings on revolving credit facility	100,000
Payments on revolving credit facilities	(350,000)
Issuances of common stock for employee stock benefit plans	24,948	19,406
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(10,794)	(11,928)
Purchase of treasury stock	(29,742)	(11,250)
Settlement (prepayment) of accelerated share repurchase program	20,000	11,250
Cash dividends paid	(67,432)	(62,356)
Net cash provided by (used in) financing activities	(10,485)	(183,215)
Net increase (decrease) in cash and cash equivalents inclusive of restricted cash	96,999	(99,401)
Cash and cash equivalents inclusive of restricted cash at beginning of period	777,596	824,088
Cash and cash equivalents inclusive of restricted cash at end of period	$ 874,595	$ 724,687

Nature of Operations

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Operations

NOTE 1 Nature of Operations

Brown & Brown, Inc., a Florida corporation, and its subsidiaries (collectively, “Brown & Brown” or the “Company”) is a diversified insurance agency, wholesale brokerage, insurance programs and service organization that markets and sells insurance products and services, primarily in the property, casualty and employee benefits areas. Brown & Brown’s business is divided into four reportable segments. The Retail Segment provides a broad range of insurance products and services to commercial, public and quasi-public entities, and to professional and individual customers. The National Programs Segment, which acts as a managing general agent (“MGA”), provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through a nationwide network of independent agents, including Brown & Brown retail agents. The Wholesale Brokerage Segment markets and sells excess and surplus commercial and personal lines insurance, primarily through independent agents and brokers, as well as Brown & Brown retail agents. The Services Segment provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services and claims adjusting services.

Basis of Financial Reporting

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Financial Reporting

NOTE 2 Basis of Financial Reporting

The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of recurring accruals) necessary for a fair presentation have been included. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes thereto set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

The preparation of these financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Condensed Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Recently Issued Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which provides guidance for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU 2018-15 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The impact of ASU 2018-15 is not expected to be material to the Company.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The new guidance eliminates Step 2 of the goodwill impairment test. The updated guidance requires an entity to perform its annual or interim goodwill impairment test by comparing the fair value of the reporting unit to its carrying value, and recognizing a non-cash impairment charge for the amount by which the carrying value exceeds the reporting unit’s fair value with the loss not exceeding the total amount of goodwill allocated to that reporting unit. ASU 2017-04 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 and will be applied prospectively. The Company is currently evaluating the impact of this guidance on future interim or annual goodwill impairment tests performed.

Recently Adopted Accounting Standards

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“Topic 842”), which provides guidance for accounting for leases. Under Topic 842, all leases are required to be recorded on the balance sheet and are classified as either operating leases or finance leases. Effective as of January 1, 2019, the Company adopted Topic 842, and all related amendments, which established Accounting Standards Codification (“ASC”) Topic 842. The Company adopted these standards by the recognition of right-of-use assets and related lease liabilities on the balance sheet. As permitted by Topic 842, the Company elected the transition practical expedient to adopt as of January 1, 2019, the date of initial application under the modified retrospective approach for leases existing at that date, with an adjustment to retained earnings. As a result, the Consolidated Balance Sheet at December 31, 2018 was not restated and continues to be reported under ASC Topic 840 (“Topic 840”) which did not require the recognition of operating lease liabilities on the balance sheet, and thus is not comparative. For the nine months ended September 30, 2019, all of the Company's leases are classified as operating leases, which are primarily real estate leases for office space. The expense recognition for operating leases under Topic 842 is substantially consistent with Topic 840, where operating lease charges are recorded entirely in operating expenses. As a result, there is no significant difference in the Company's results of operations presented in the Company's Condensed Consolidated Statements of Income for each period presented.

The adoption of Topic 842 had a significant impact on the Company's balance sheet with the recognition of the operating lease right-of-use asset and the liability for operating leases. Upon adoption, leases that were classified as operating leases under Topic 840 were classified as operating leases under Topic 842. For the adoption of Topic 842, the Company recorded an adjustment of $202.9 million to operating lease right-of-use asset and the related lease liability, with no impact to retained earnings. The deferred rent previously accrued under Topic 840 was reclassified to the right-of-use asset upon the adoption of Topic 842. The lease liability is the present value of the remaining minimum lease payments, determined under Topic 840, discounted using the Company's incremental borrowing rate at the effective date of January 1, 2019. As permitted under Topic 842, the Company elected to use the practical expedient that permits the Company to not reassess whether a contract is or contains a lease, the classification of the Company's existing operating leases, and initial direct costs for any existing leases. The Company did not elect the practical expedient to use hindsight in determining the lease term (when considering lessee options to extend or terminate the lease and to purchase the underlying asset) and in assessing impairment of the Company's right-of-use assets. The application of the practical expedient did not have a significant impact on the measurement of the operating lease liability.

The impact of the adoption of Topic 842 on the balance sheet at January 1, 2019 was (in thousands):

(in thousands)	Balance at December 31, 2018		Adjustments due to Topic 842			Balance at January 1, 2019
Balance Sheet
Assets:
Other current assets		128,716		(3,004	)		125,712
Operating lease assets		—		178,304			178,304
Total Assets		6,688,668		175,300			6,863,968
Liabilities:
Accrued expenses and other liabilities		279,310		13,836			293,146
Operating lease liabilities		—		161,464			161,464
Total Liabilities		3,688,100		175,300			3,863,400

For contracts entered into on or after the January 1, 2019, at the inception of a contract the Company assesses whether the contract is, or contains, a lease. This assessment is based on: (1) whether the contract involves the use of a distinct identified asset, (2) whether the Company obtains the right to substantially all the economic benefit from the use of the asset throughout the period, and (3) whether the Company has the right to direct the use of the asset. Leases entered into prior to January 1, 2019 are accounted for under Topic 840 and were not reassessed. For real estate leases that contain both lease and non-lease components, the Company elected to account the lease components together with non-lease components (e.g., common-area maintenance).

Leases are classified as either finance leases or operating leases. A lease is classified as a finance lease if any one of the following criteria are met: the lease transfers ownership of the asset by the end of the lease term, the lease contains an option to purchase the asset that is reasonably certain to be exercised, or the lease term is for a major part of the remaining useful life of the asset or the present value of the lease payments equals or exceeds substantially all of the fair value of the asset. A lease is classified as an operating lease if it does not meet any one of these criteria. None of the Company's real estate leases for office space meet the definition of a finance lease. The Company's policy is to own, rather than lease, equipment.

For leases at the lease commencement date, a right-of-use asset and a lease liability are recognized. The right-of-use asset represents the right to use the leased asset for the lease term. The right-of-use asset is initially measured at cost, which primarily comprises the initial amount of the lease liability, plus any initial direct costs incurred, less any lease incentives received. The lease liability is initially measured at the present value of the lease payments under the lease. For the Company's operating leases, the lease payments are discounted using an incremental borrowing rate, which approximates the rate of interest that would be paid on a secured borrowing in an amount equal to the lease payments for the underlying asset under similar terms.

Lease payments included in the measurement of the lease liability comprise the following: the fixed noncancelable lease payments, payments for optional renewal periods where it is reasonably certain the renewal period will be exercised, and payments for early termination options unless it is reasonably certain the lease will not be terminated early. Some of the Company's real estate leases contain variable lease payments, including payments based on an index or rate. Variable lease payments based on an index or rate are initially measured using the index or rate in effect at lease commencement and based on the minimum amount stated in the lease. Lease components are included in the measurement of the initial lease liability. Additional payments based on the change in an index or rate, or payments based on a change in the Company's portion of the operating expenses, including real estate taxes and insurance, are recorded as a period expense when incurred. Lease modifications result in remeasurement of the right-of-use assets and the lease liability.

Lease expense for operating leases consists of the lease payments, inclusive of lease incentives, plus any initial direct costs, and is recognized on a straight-line basis over the lease term. Included in lease expense are any variable lease payments incurred in the period that were not included in the initial lease liability.

The Company elected not to recognize right-of-use assets and lease liabilities for short-term leases that have a total term of 12 months or less. The effect of short-term leases on the Company's right-of-use asset and lease liability would not be significant.

Revenues

9 Months Ended

Sep. 30, 2019

Revenues [Abstract]

Revenues

NOTE 3 Revenues

The following tables present the revenues disaggregated by revenue source:

	Three months ended September 30, 2019
(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Other ⁽⁸⁾			Total
Base commissions ⁽¹⁾	$	248,488		$	92,224		$	68,162	$	—	$	—		$	408,874
Fees ⁽²⁾		65,501			44,984			15,850		50,069		(288	)		176,116
Incentive commissions ⁽³⁾		12,852			258			449		—		5			13,564
Profit-sharing contingent commissions ⁽⁴⁾		7,848			4,412			1,927		—		—			14,187
Guaranteed supplemental commissions ⁽⁵⁾		3,415			609			598		—		—			4,622
Investment income⁽⁶⁾		28			375			48		35		1,182			1,668
Other income, net ⁽⁷⁾		(420	)		(8	)		75		2		3			(348	)
Total Revenues	$	337,712		$	142,854		$	87,109	$	50,106	$	902		$	618,683

	Nine months ended September 30, 2019
(in thousands)	Retail		National Programs			Wholesale Brokerage		Services		Other ⁽⁸⁾			Total
Base commissions ⁽¹⁾	$	755,108	$	254,495		$	187,388	$	—	$	13		$	1,197,004
Fees ⁽²⁾		178,205		109,702			42,299		150,276		(863	)		479,619
Incentive commissions ⁽³⁾		68,342		(669	)		947		—		23			68,643
Profit-sharing contingent commissions ⁽⁴⁾		26,054		9,365			6,073		—		—			41,492
Guaranteed supplemental commissions ⁽⁵⁾		9,211		10,225			1,564		—		—			21,000
Investment income⁽⁶⁾		45		1,071			131		117		2,910			4,274
Other income, net ⁽⁷⁾		716		42			387		2		3			1,150
Total Revenues	$	1,037,681	$	384,231		$	238,789	$	150,395	$	2,086		$	1,813,182

(1)

Base commissions generally represent a percentage of the premium paid by an insured and are affected by fluctuations in both premium rate levels charged by insurance companies and the insureds’ underlying “insurable exposure units,” which are units that insurance companies use to measure or express insurance exposed to risk (such as property values, or sales and payroll levels) to determine what premium to charge the insured. Insurance companies establish these premium rates based upon many factors, including loss experience, risk profile and reinsurance rates paid by such insurance companies, none of which the Company controls.

(2)	Fee revenues relate to fees for services other than securing coverage for the Company's customers and fees negotiated in lieu of commissions.

(3)	Incentive commissions include additional commissions over base commissions received from insurance carriers based on predetermined production levels mutually agreed upon by both parties.

(4)	Profit-sharing contingent commissions are based primarily on underwriting results, but may also reflect considerations for volume, growth and/or retention.

(5)	Guaranteed supplemental commissions represent guaranteed fixed-base agreements in lieu of profit-sharing contingent commissions.

(6)	Investment income consists primarily of interest on cash and investments.

(7)	Other income consists primarily of legal settlements and other miscellaneous income.

(8)	Fees within other reflects the elimination of intercompany revenues.

Contract Assets and Liabilities

The balances of contract assets and contract liabilities arising from contracts with customers as of September 30, 2019 and December 31, 2018 were as follows:

(in thousands)	September 30, 2019		December 31, 2018
Contract assets	$	297,696	$	265,994
Contract liabilities	$	55,138	$	53,496

Unbilled receivables (contract assets) arise when the Company recognizes revenue for amounts which have not yet been billed in the Company's systems and are reflected in premiums, commissions and fee receivables in the Company's Condensed Consolidated Balance Sheet. Deferred revenue (contract liabilities) relates to payments received in advance of performance under the contract before the transfer of a good or service to the customer. Deferred revenue is reflected within accrued expenses and other liabilities for those to be recognized in less than 12 months and in other liabilities for those to be recognized more than 12 months from the date presented in the Company's Condensed Consolidated Balance Sheet.

As of September 30, 2019, deferred revenue consisted of $37.5 million as current portion to be recognized within one year and $17.6 million in long term to be recognized beyond one year. As of December 31, 2018, deferred revenue consisted of $37.0 million as current portion to be recognized within one year and $16.5 million in long-term deferred revenue to be recognized beyond one year.

During the nine months ended September 30, 2019, the amount of revenue recognized related to performance obligations satisfied in a previous period, was $14.0 million. This revenue is primarily related to variable consideration and is inclusive of changes due to estimates.

Other Assets and Deferred Cost

Incremental cost to obtain - The Company defers certain costs to obtain customer contracts primarily as they relate to commission-based compensation plans in the Retail Segment, in which the Company pays an incremental amount of compensation on new business. These incremental costs are deferred and amortized over a 15-year period. The cost to obtain balance within the other assets caption in the Company's Condensed Consolidated Balance Sheet was $23.4 million and $13.2 million as of September 30, 2019 and December 31, 2018, respectively. For the nine months ended September 30, 2019, the Company deferred $11.6 million of incremental cost to obtain customer contracts. The Company recorded an expense of $1.4 million associated with the incremental cost to obtain customer contracts for the nine months ended September 30, 2019.

Cost to fulfill - The Company defers certain costs to fulfill contracts and recognizes these costs as the associated performance obligations are fulfilled. The cost to fulfill balance within the other current assets caption in the Company's Condensed Consolidated Balance Sheet was $68.0 million and $69.8 million as of September 30, 2019 and December 31, 2018, respectively. For the nine months ended September 30, 2019, the Company had net expense of $1.9 million related to the release of previously deferred contract fulfillment costs associated with performance obligations that were satisfied in the period, net of current year deferrals for costs incurred that related to performance obligations yet to be fulfilled.

Net Income Per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Income Per Share

NOTE 4 Net Income Per Share

Basic net income per share is computed based on the weighted average number of common shares (including participating securities) issued and outstanding during the period. Diluted net income per share is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. The following is a reconciliation between basic and diluted weighted average shares outstanding:

	For the three months ended September 30,						For the nine months ended September 30,
(in thousands, except per share data)	2019			2018			2019			2018
Net income	$	115,506		$	106,053		$	321,995		$	270,803
Net income attributable to unvested awarded performance stock		(3,772	)		(2,716	)		(10,386	)		(6,185	)
Net income attributable to common shares	$	111,734		$	103,337		$	311,609		$	264,618
Weighted average number of common shares outstanding – basic		282,178			278,132			281,505			276,744
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic		(9,216	)		(7,124	)		(9,080	)		(6,321	)
Weighted average number of common shares outstanding for basic net income per common share		272,962			271,008			272,425			270,423
Dilutive effect of stock options		2,113			4,274			2,104			5,191
Weighted average number of shares outstanding – diluted		275,075			275,282			274,529			275,614
Net income per share:
Basic	$	0.41		$	0.38		$	1.14		$	0.98
Diluted	$	0.41		$	0.38		$	1.14		$	0.96

Business Combinations

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Business Combinations

NOTE 5 Business Combinations

During the nine months ended September 30, 2019, Brown & Brown acquired the assets and assumed certain liabilities of seventeen insurance intermediaries and all of the stock of one insurance intermediary. Additionally, miscellaneous adjustments were recorded to the purchase price allocation of certain prior acquisitions completed within the last 12 months as permitted by Accounting Standards Codification Topic 805 — Business Combinations (“ASC 805”). Such adjustments are presented in the “Other” category within the following two tables. The recorded purchase price for all acquisitions includes an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the Condensed Consolidated Statements of Income when incurred.

The fair value of earn-out obligations is based on the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, the acquired business’s future performance is estimated using financial projections developed by management for the acquired business and reflects market participant assumptions regarding revenue growth and/or profitability. The expected future payments are estimated on the basis of the earn-out formula and performance targets specified in each purchase agreement compared to the associated financial projections. These payments are

then discounted to present value using a risk-adjusted rate that takes into consideration the likelihood that the forecasted earn-out payments will be made.

Based on the acquisition date and the complexity of the underlying valuation work, certain amounts included in the Company’s Condensed Consolidated Financial Statements may be provisional and thus subject to further adjustments within the permitted measurement period, as defined in ASC 805. For the nine months ended September 30, 2019, adjustments were made within the permitted measurement period that resulted in a decrease in the aggregate purchase price of the affected acquisitions of $6.6 million relating to the assumption of certain liabilities. These measurement period adjustments have been reflected as current period adjustments in the nine months ended September 30, 2019 in accordance with the guidance in ASU 2015-16 “Business Combinations.” The measurement period adjustments primarily impacted goodwill, with no effect on earnings or cash in the current period.

Cash paid for acquisitions was $291.6 million in the nine-month period ended September 30, 2019. The Company completed 18 acquisitions (excluding book of business purchases) in the nine-month period ended September 30, 2019. The Company completed 18 acquisitions (excluding book of business purchases) in the nine-month period ended September 30, 2018.

The following table summarizes the purchase price allocations made as of the date of each acquisition for current year acquisitions and adjustments made during the measurement period for prior year acquisitions. During the measurement periods, the Company will adjust assets or liabilities if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets and liabilities as of that date. These adjustments are made in the period in which the amounts are determined and the current period income effect of such adjustments will be calculated as if the adjustments had been completed as of the acquisition date.

(in thousands)
Name	Business segment	Effective date of acquisition	Cash paid		Common Stock Issued		Other payable		Recorded earn-out payable		Net assets acquired		Maximum potential earn- out payable
Smith Insurance Associates, Inc. (Smith)	Retail	February 1, 2019	$	20,129	$	—	$	—	$	2,704	$	22,833	$	4,550
Donald P. Pipino Company, LTD (Pipino)	Retail	February 1, 2019		16,420		—		135		9,821		26,376		12,996
Cossio Insurance Agency (Cossio)	Retail	March 1, 2019		13,990		—		10		1,710		15,710		2,000
Medval LLC (Medval)	Services	March 1, 2019		29,106		—		100		1,684		30,890		2,500
United Development Systems, Inc. (United)	Retail	May 1, 2019		18,987		—		388		3,268		22,643		8,625
Twinbrook Insurance Brokerage, Inc. (Twinbrook)	Retail	June 1, 2019		26,251		—		400		1,565		28,216		5,073
Innovative Risk Solutions, Inc. (IRS)	Retail	July 1, 2019		26,435		—		2,465		5,482		34,382		9,000
WBR Insurance Agency, LLC et al (WBR)	Retail	August 1, 2019		10,667		—		203		2,197		13,067		4,575
West Ridge Insurance Agency, Inc. d/b/a Yozell Associates (Yozell)	Retail	August 1, 2019		13,030		—		470		768		14,268		6,730
CKP Insurance, LLC (CKP)	Retail	August 1, 2019		89,190		20,000		4,000		38,093		151,283		76,500
Other	Various	Various		27,405		—		1,291		4,172		32,868		9,404
Total			$	291,610	$	20,000	$	9,462	$	71,464	$	392,536	$	141,953

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition and adjustments made during the measurement period of the prior year acquisitions.

(in thousands)	Smith			Pipino			Cossio		Medval			United			Twinbrook			IRS			WBR			Yozell		CKP			Other			Total
Cash	$	—		$	—		$	—	$	3,217		$	—		$	—		$	—		$	—		$	—	$	—		$	—		$	3,217
Other current assets		473			819			17		1,708			477			—			1,200			169			1,473		8,900			(6,173	)		9,063
Fixed assets		39			112			29		50			20			85			11			10			12		193			(166	)		395
Goodwill		16,249			16,765			11,319		19,108			15,111			19,839			24,040			9,376			9,212		110,765			23,523			275,307
Purchased customer accounts		6,500			11,360			4,324		7,300			7,065			8,557			9,246			4,022			3,550		32,274			10,732			104,930
Non-compete agreements		41			11			21		1			11			12			11			34			21		21			128			312
Other assets		—			772			—		15			—			—			—			—			—		—			(732	)		55
Total assets acquired		23,302			29,839			15,710		31,399			22,684			28,493			34,508			13,611			14,268		152,153			27,312			393,279
Other current liabilities		(469	)		(3,463	)		—		(480	)		(41	)		(277	)		(126	)		(166	)		—		(870	)		5,556			(336	)
Other liabilities		—			—			—		(29	)		—			—			—			(378	)		—		—			—			(407	)
Total liabilities assumed		(469	)		(3,463	)		—		(509	)		(41	)		(277	)		(126	)		(544	)		—		(870	)		5,556			(743	)
Net assets acquired	$	22,833		$	26,376		$	15,710	$	30,890		$	22,643		$	28,216		$	34,382		$	13,067		$	14,268	$	151,283		$	32,868		$	392,536

The other column represents current year acquisitions with total net assets acquired of less than $10.0 million and adjustments from prior year acquisitions that were made within the permitted measurement period.

The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15 years; and non-compete agreements, 5 years.

Goodwill of $275.3 million, which is net of any opening balance sheet adjustments within the allowable measurement period, was allocated to the Retail, National Programs, Wholesale Brokerage and Services Segments in the amounts of $249.7 million, $0.1 million, $6.2 million and $19.3 million, respectively. Of the total goodwill of $275.3 million, the amount currently deductible for income tax purposes is $203.8 million and the remaining $71.5 million relates to the recorded earn-out payables and will not be deductible until it is earned and paid.

For the acquisitions completed during 2019, the results of operations since the acquisition dates have been combined with those of the Company. The total revenues from the acquisitions completed through September 30, 2019, included in the Condensed Consolidated Statement of Income for the nine months ended September 30, 2019, was $31.0 million. The income before income taxes, including the intercompany cost of capital charge, from the acquisitions completed through September 30, 2019, included in the Condensed Consolidated Statement of Income for the nine months ended September 30, 2019, was $0.3 million. If the acquisitions had occurred as of the beginning of the respective periods, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.

(UNAUDITED)	Three months ended September 30,				Nine months ended September 30,
(in thousands, except per share data)	2019		2018		2019		2018
Total revenues	$	619,359	$	547,196	$	1,853,193	$	1,578,627
Income before income taxes	$	152,038	$	147,351	$	438,289	$	385,327
Net income	$	115,658	$	109,663	$	332,940	$	288,373
Net income per share:
Basic	$	0.41	$	0.39	$	1.18	$	1.04
Diluted	$	0.41	$	0.39	$	1.17	$	1.02
Weighted average number of shares outstanding:
Basic		272,962		271,008		272,425		270,423
Diluted		275,075		275,282		274,529		275,614

As of September 30, 2019 and 2018, the fair values of the estimated acquisition earn-out payables were re-evaluated and measured at fair value on a recurring basis using unobservable inputs (Level 3) as defined in ASC 820- Fair Value Measurement. The resulting additions, payments, and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the nine months ended September 30, 2019 and 2018, were as follows:

	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2019			2018			2019			2018
Balance as of the beginning of the period	$	104,976		$	52,540		$	89,924		$	36,175
Additions to estimated acquisition earn-out payables		47,498			29,646			71,464			51,717
Payments for estimated acquisition earn-out payables		(601	)		(16,521	)		(7,865	)		(25,112	)
Subtotal		151,873			65,665			153,523			62,780
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables		(6,573	)		(928	)		(10,873	)		945
Interest expense accretion		1,303			571			3,953			1,583
Net change in earnings from estimated acquisition earn-out payables		(5,270	)		(357	)		(6,920	)		2,528
Balance as of September 30,	$	146,603		$	65,308		$	146,603		$	65,308

Of the $146.6 million estimated acquisition earn-out payables as of September 30, 2019, $23.7 million was recorded as accounts payable and $122.9 million was recorded as other non-current liabilities. As of September 30, 2019, the maximum future acquisition contingency payments related to all acquisitions was $310.6 million, inclusive of the $146.6 million estimated acquisition earn-out payables as of September 30, 2019. Included within the additions to estimated acquisition earn-out payables are any adjustments to opening balance sheet items within the allowable measurement period, which may therefore differ from previously reported amounts.

Goodwill

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

NOTE 6 Goodwill

Goodwill is subject to at least an annual assessment for impairment by applying a fair value-based test. The Company completed its most recent annual assessment as of November 30, 2018, and identified no impairment as a result of the evaluation.

The changes in the carrying value of goodwill by reportable segment for the nine months ended September 30, 2019 are as follows:

(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Total
Balance as of December 31, 2018	$	2,063,150		$	926,206		$	291,622	$	151,808	$	3,432,786
Goodwill of acquired businesses		249,691			74			6,189		19,353		275,307
Goodwill disposed of relating to sales of businesses		(5,089	)		(739	)		—		—		(5,828	)
Balance as of September 30, 2019	$	2,307,752		$	925,541		$	297,811	$	171,161	$	3,702,265

Amortizable Intangible Assets

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

NOTE 7 Amortizable Intangible Assets

Amortizable intangible assets at September 30, 2019 and December 31, 2018 consisted of the following:

	September 30, 2019									December 31, 2018
(in thousands)	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life (years) ₍₁₎		Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life (years) ₍₁₎
Purchased customer accounts	$	1,905,638	$	(985,436	)	$	920,202		15.0	$	1,804,404	$	(909,415	)	$	894,989		14.9
Non-compete agreements		33,781		(30,565	)		3,216		4.5		33,469		(29,651	)		3,818		4.5
Total	$	1,939,419	$	(1,016,001	)	$	923,418			$	1,837,873	$	(939,066	)	$	898,807

(1)	Weighted average life calculated as of the date of acquisition.

Amortization expense for amortizable intangible assets for the years ending December 31, 2019, 2020, 2021, 2022 and 2023 is estimated to be $104.7 million, $99.8 million, $96.3 million, $91.8 million, and $84.8 million, respectively.

Long-Term Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 8 Long-Term Debt

Long-term debt at September 30, 2019 and December 31, 2018 consisted of the following:

(in thousands)	September 30, 2019			December 31, 2018
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	40,000		$	35,000
Current portion of 5-year term loan facility expires 2023		15,000			15,000
Total current portion of long-term debt		55,000			50,000
Long-term debt:
Note agreements:
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	$	499,219		$	499,101
4.500% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2029		349,470			—
Total notes		848,689			499,101
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022		300,000			330,000
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022		100,000			350,000
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires December 21, 2023		273,750			285,000
Total credit agreements		673,750			965,000
Debt issuance costs (contra)		(8,879	)		(7,111	)
Total long-term debt less unamortized discount and debt issuance costs		1,513,560			1,456,990
Current portion of long-term debt		55,000			50,000
Total debt	$	1,568,560		$	1,506,990

On June 28, 2017, the Company entered into an amended and restated credit agreement (the “Amended and Restated Credit Agreement”) with the lenders named therein, JPMorgan Chase Bank, N.A. as administrative agent and certain other banks as co-syndication agents and co-documentation agents. The Amended and Restated Credit Agreement amended and restated the credit agreement dated April 17, 2014, among such parties (the “Original Credit Agreement”). The Amended and Restated Credit Agreement extends the applicable maturity date of the existing revolving credit facility (the “Revolving Credit Facility”) of $800.0 million to June 28, 2022 and re-evidences unsecured term loans at $400.0 million while also extending the applicable maturity date to June 28, 2022. The quarterly term loan principal amortization schedule was reset. At the time of the execution of the Amended and Restated Credit Agreement, $67.5 million of principal from the original unsecured term loans was repaid using operating cash balances, and the Company added an additional $2.8 million in debt issuance costs related to the Revolving Credit Facility to the Condensed Consolidated Balance Sheet. The Company also expensed to the Condensed Consolidated Statements of Income $0.2 million of debt issuance costs related to the Original Credit Agreement due to certain lenders exiting prior to execution of the Amended and Restated Credit Agreement. The Company also carried forward $1.6 million on the Condensed Consolidated Balance Sheet the remaining unamortized portion of the Original Credit Agreement debt issuance costs, which will be amortized over the term of the Amended and Restated Credit Agreement. On September 30, 2019, the Company made a scheduled principal payment of $10.0 million per the terms of the Amended and Restated Credit Agreement. As of September 30, 2019, there was an outstanding debt balance issued under the term loan of the Amended and Restated Credit Agreement of $340.0 million and $100.0 million borrowings outstanding against the Revolving Credit Facility. As of December 31, 2018, there was an outstanding debt balance issued under the term loan of the Amended and Restated Credit Agreement of $365.0 million with $350.0 million in borrowings outstanding against the Revolving Credit Facility. The Company had borrowed approximately $600.0 million under its Revolving Credit Facility on November 15, 2018 in connection with the closing of the acquisition of certain assets and assumption of certain liabilities of the Hays Companies. Per the terms of the Amended and Restated Credit Agreement, a scheduled principal payment of $10.0 million is due December 31, 2019.

On September 18, 2014, the Company issued $500.0 million of 4.200% unsecured Senior Notes due in 2024. The Senior Notes were given investment grade ratings of BBB-/Baa3 with a stable outlook. The notes are subject to certain covenant restrictions and regulations which are customary for credit rated obligations. At the time of funding, the proceeds were offered at a discount of the original note amount which also excluded an underwriting fee discount. The net proceeds received from the issuance were used to repay the outstanding balance of $475.0 million on the Revolving Credit Facility and for other general corporate purposes. As of September 30, 2019 and December 31, 2018, there was an outstanding debt balance of $500.0 million exclusive of the associated discount balance.

On December 21, 2018, the Company entered into a term loan credit agreement (the “Term Loan Credit Agreement”) with the lenders named therein, Wells Fargo Bank, National Association, as administrative agent, and certain other banks as co-syndication agents and as joint

lead arrangers and joint bookrunners. The Term Loan Credit Agreement provides for an unsecured term loan in the initial amount of $300.0 million, which may, subject to lenders’ discretion, potentially be increased up to an aggregate amount of $450.0 million (the “Term Loan”). The Term Loan is repayable over the five-year term from the effective date of the Term Loan Credit Agreement, which was December 21, 2018. Based on the Company’s net debt leverage ratio or a non-credit enhanced senior unsecured long-term debt rating as determined by Moody’s Investor Service and Standard & Poor’s Rating Service, the rates of interest charged on the term loan are 1.00% to 1.75%, above the adjusted 1-Month LIBOR rate. On December 21, 2018, the Company borrowed $300.0 million under the Term Loan Credit Agreement and used $250.0 million of the proceeds to reduce indebtedness under the Company’s Amended and Restated Credit Agreement, dated June 28, 2017, with the lenders named therein, JPMorgan Chase Bank, N.A., as administrative agent, and certain other banks as co-syndication agents and co-documentation agents (the “Revolving Credit Facility”). As of September 30, 2019, there was an outstanding debt balance issued under the Term Loan of $288.8 million. As of December 31, 2018, there was an outstanding debt balance issued under the Term Loan of $300.0 million. Per the terms of the Term Loan Credit Agreement, a scheduled principal payment of $3.8 million is due December 31, 2019.

On March 11, 2019, the Company completed the issuance of $350.0 million aggregate principal amount of the Company's 4.500% Senior Notes due 2029. The Senior Notes were given investment grade ratings of BBB-/Baa3 with a stable outlook. The notes are subject to certain covenant restrictions, which are customary for credit rated obligations. At the time of funding, the proceeds were offered at a discount of the original note amount, which also excluded an underwriting fee discount. The net proceeds received from the issuance were used to repay a portion of the outstanding balance of $350.0 million on the Revolving Credit Facility, utilized in connection with the financing related to the Hays Companies acquisition and for other general corporate purposes. As of September 30, 2019, there was an outstanding debt balance of $350.0 million exclusive of the associated discount balance.

The Amended and Restated Credit Agreement and Term Loan Credit Agreement require the Company to maintain certain financial ratios and comply with certain other covenants. The Company was in compliance with all such covenants as of September 30, 2019 and December 31, 2018.

The 30-day Adjusted LIBOR Rate as of September 30, 2019 was 2.063%.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

NOTE 9 Leases

Substantially all of the Company's operating lease right-of-use assets and operating lease liabilities represent real estate leases for office space used to conduct the Company's business.

The balances and classification of operating lease right-of-use assets and operating lease liabilities within the Condensed Consolidated Balance Sheet is as follows:

(in thousands)		September 30, 2019
Balance Sheet
Assets:
Operating lease right-of-use assets	Operating lease assets	$	193,419
Total Assets			193,419
Liabilities:
Current operating lease liabilities	Accrued expenses and other liabilities		41,828
Non-current operating lease liabilities	Operating lease liabilities		177,097
Total Liabilities		$	218,925

The components of lease cost for operating leases for the three and nine months ended September 30, 2019 were:

(in thousands)	Three months ended September 30, 2019			Nine months ended September 30, 2019
Operating leases:
Lease cost	$	11,581		$	36,671
Variable lease cost		1,197			2,701
Operating lease cost	$	12,778		$	39,372
Sublease income		(145	)		(329	)
Total lease cost net	$	12,633		$	39,043

The weighted average remaining lease term and the weighted average discount rate for operating leases as of September 30, 2019 were:

Weighted-average remaining lease term			6.10
Weighted-average discount rate			3.73

Maturities of the operating lease liabilities by fiscal year at September 30, 2019 for the Company's operating leases are as follows:

(in thousands)	Operating Leases
2019 (Remainder)	$	10,441
2020		50,613
2021		43,859
2022		36,448
2023		29,936
Thereafter		75,843
Total undiscounted lease payments		247,140
Less: Imputed interest		28,215
Present value of lease payments	$	218,925

At December 31, 2018, the aggregate future minimum lease payments under all non-cancelable lease agreements were as follows:

(in thousands)	December 31, 2018
2019	$	48,292
2020		43,517
2021		34,836
2022		27,035
2023		19,981
Thereafter		36,349
Total minimum future lease payments	$	210,010

Supplemental cash flow information for operating leases:

(in thousands)	Three months ended September 30, 2019		Nine months ended September 30, 2019
Cash paid for amounts included in measurement of liabilities
Operating cash flows from operating leases	$	11,816	$	37,728
Right-of-use assets obtained in exchange for new operating liabilities	$	11,660	$	38,291

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

NOTE 10 Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

Brown & Brown's cash paid during the period for interest and income taxes are summarized as follows:

	Nine months ended September 30,
(in thousands)	2019		2018
Cash paid during the period for:
Interest	$	52,127	$	32,896
Income taxes	$	85,970	$	21,380

Brown & Brown’s significant non-cash investing and financing activities are summarized as follows:

	Nine months ended September 30,
(in thousands)	2019		2018
Other payable issued for purchased customer accounts	$	9,462	$	3,339
Estimated acquisition earn-out payables and related charges	$	71,464	$	51,717
Notes received on the sale of fixed assets and customer accounts	$	9,903	$	—

The Company's restricted cash balance is composed of funds held in separate premium trust accounts as required by state law or, in some cases, by agreement with carrier partners. The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of September 30, 2019 and 2018.

	Balance as of September 30,
(in thousands)	2019		2018
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	497,510	$	422,971
Restricted cash		377,085		301,716
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	874,595	$	724,687

The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2018 and 2017.

	Balance as of December 31,
(in thousands)	2018		2017
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	438,961	$	573,383
Restricted cash		338,635		250,705
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	777,596	$	824,088

In the preparation of the Statement of Cash Flows in this Quarterly Report on Form 10-Q, beginning balance sheet balances for 2018 were adjusted to reflect the modified retrospective adoption of Accounting Standards Update No.2014-09, “Revenue from Contracts with Customers” and Accounting Standards Codification Topic 340 - Other Assets and Deferred Cost, thereby reflecting in the Statement of Cash Flows the change in operating assets and liabilities for the period, excluding the initial impact of adoption of these new accounting standards.

Legal and Regulatory Proceedings

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Legal and Regulatory Proceedings

NOTE 11 Legal and Regulatory Proceedings

The Company is involved in numerous pending or threatened proceedings by or against Brown & Brown, Inc. or one or more of its subsidiaries that arise in the ordinary course of business. The damages that may be claimed against the Company in these various proceedings are in some cases substantial, including in certain instances claims for punitive or extraordinary damages. Some of these claims and lawsuits have been resolved; others are in the process of being resolved and others are still in the investigation or discovery phase. The Company will continue to respond appropriately to these claims and lawsuits and to vigorously protect its interests.

The Company continues to assess certain litigation and claims to determine the amounts, if any, that management believes will be paid as a result of such claims and litigation and, therefore, additional losses may be accrued and paid in the future, which could adversely impact the Company’s operating results, cash flows and overall liquidity. The Company maintains third-party insurance policies to provide coverage for certain legal claims, in an effort to mitigate its overall exposure to unanticipated claims or adverse decisions. However, as (i) one or more of the Company’s insurance carriers could take the position that portions of these claims are not covered by the Company’s insurance, (ii) to the extent that payments are made to resolve claims and lawsuits, applicable insurance policy limits are eroded and (iii) the claims and lawsuits relating to these matters are continuing to develop, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by unfavorable resolutions of these matters. Based upon the AM Best Company ratings of these third-party insurers, management does not believe there is a substantial risk of an insurer’s material non-performance related to any current insured claims.

On the basis of current information, the availability of insurance and legal advice, in management’s opinion, the Company is not currently involved in any legal proceedings which, individually or in the aggregate, would have a material adverse effect on its financial condition, operations and/or cash flows.

Segment Information

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Segment Information

NOTE 12 Segment Information

Brown & Brown’s business is divided into four reportable segments: (1) the Retail Segment, which provides a broad range of insurance products and services to commercial, public and quasi-public entities, and to professional and individual customers, (2) the National Programs Segment, which acts as an MGA, provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through nationwide networks of independent agents, and Brown & Brown retail agents, (3) the Wholesale Brokerage Segment, which markets and sells excess and surplus commercial and personal lines insurance, primarily through independent agents and brokers, as well as Brown & Brown retail agents, and (4) the Services Segment, which provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services and claims adjusting services.

Brown & Brown conducts all of its operations within the United States of America, except for a wholesale brokerage operation based in London, England, retail operations in Bermuda and the Cayman Islands, and a national programs operation in Canada. These operations earned $4.4 million and $3.7 million of total revenues for the three months ended September 30, 2019 and 2018, respectively. These operations earned

$12.4 million and $11.3 million of total revenues for the nine months ended September 30, 2019 and 2018, respectively. Long-lived assets held outside of the United States as of September 30, 2019 and 2018 were not material.

The accounting policies of the reportable segments are the same as those described in Note 1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The Company evaluates the performance of its segments based upon revenues and income before income taxes. Inter-segment revenues are eliminated.

Summarized financial information concerning the Company’s reportable segments is shown in the following tables. The “Other” column includes any income and expenses not allocated to reportable segments, corporate-related items, including the intercompany interest expense charge to the reporting segment.

	Three months ended September 30, 2019
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	337,712	$	142,854	$	87,109	$	50,106	$	902		$	618,683
Investment income	$	28	$	375	$	48	$	35	$	1,182		$	1,668
Amortization	$	15,821	$	6,264	$	2,797	$	1,390	$	—		$	26,272
Depreciation	$	1,897	$	1,779	$	422	$	315	$	1,402		$	5,815
Interest expense	$	22,287	$	3,557	$	1,105	$	1,164	$	(11,799	)	$	16,314
Income before income taxes	$	51,133	$	46,629	$	28,908	$	14,775	$	10,393		$	151,838
Total assets	$	6,155,670	$	3,315,656	$	1,406,709	$	469,292	$	(3,666,663	)	$	7,680,664
Capital expenditures	$	2,266	$	1,276	$	768	$	209	$	7,665		$	12,184

	Three months ended September 30, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	261,087	$	143,519	$	78,009	$	48,105	$	130		$	530,850
Investment income	$	1	$	138	$	44	$	51	$	485		$	719
Amortization	$	10,754	$	6,736	$	2,878	$	1,269	$	—		$	21,637
Depreciation	$	1,236	$	1,346	$	385	$	393	$	1,899		$	5,259
Interest expense	$	7,468	$	6,147	$	1,233	$	846	$	(6,731	)	$	8,963
Income before income taxes	$	61,224	$	46,707	$	23,614	$	6,988	$	3,967		$	142,500
Total assets	$	4,651,080	$	2,933,465	$	1,272,795	$	448,027	$	(3,502,561	)	$	5,802,806
Capital expenditures	$	1,467	$	2,420	$	895	$	366	$	4,321		$	9,469

	Nine months ended September 30, 2019
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	1,037,681	$	384,231	$	238,789	$	150,395	$	2,086		$	1,813,182
Investment income	$	45	$	1,071	$	131	$	117	$	2,910		$	4,274
Amortization	$	46,622	$	19,217	$	8,490	$	4,089	$	—		$	78,418
Depreciation	$	5,440	$	4,990	$	1,251	$	902	$	4,933		$	17,516
Interest expense	$	64,641	$	13,134	$	3,692	$	3,239	$	(36,901	)	$	47,805
Income before income taxes	$	189,191	$	106,188	$	67,421	$	33,220	$	27,860		$	423,880
Total assets	$	6,155,670	$	3,315,656	$	1,406,709	$	469,292	$	(3,666,663	)	$	7,680,664
Capital expenditures	$	7,810	$	7,786	$	2,470	$	540	$	28,752		$	47,358

	Nine months ended September 30, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	772,806	$	374,434	$	219,725	$	138,038	$	495		$	1,505,498
Investment income	$	2	$	384	$	125	$	160	$	1,380		$	2,051
Amortization	$	31,498	$	19,383	$	8,537	$	3,543	$	—		$	62,961
Depreciation	$	3,746	$	4,087	$	1,238	$	1,183	$	6,156		$	16,410
Interest expense	$	21,377	$	20,019	$	4,039	$	2,023	$	(18,772	)	$	28,686
Income before income taxes	$	175,984	$	91,809	$	55,544	$	23,889	$	14,625		$	361,851
Total assets	$	4,651,080	$	2,933,465	$	1,272,795	$	448,027	$	(3,502,561	)	$	5,802,806
Capital expenditures	$	5,828	$	7,313	$	1,762	$	798	$	13,158		$	28,859

Investments

9 Months Ended

Sep. 30, 2019

Investments Debt And Equity Securities [Abstract]

Investments

NOTE 13 Investments

At September 30, 2019, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:

(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	24,854	$	183	$	(37	)	$	25,000
Corporate debt		5,329		63		(10	)		5,382
Total	$	30,183	$	246	$	(47	)	$	30,382

At September 30, 2019, the Company held $25.0 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipalities, and $5.4 million issued by corporations with investment grade ratings. Of that total, $2.2 million is classified as short-term investments on the Condensed Consolidated Balance Sheet as maturities are less than one-year, which also includes $7.7 million that is related to time deposits held with various financial institutions.

For securities in a loss position, the following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2019:

	Less than 12 Months					12 Months or More					Total
(in thousands)	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,435	$	(32	)	$	2,246	$	(5	)	$	7,681	$	(37	)
Corporate debt		997		(10	)		—		—			997		(10	)
Total	$	6,432	$	(42	)	$	2,246	$	(5	)	$	8,678	$	(47	)

The unrealized losses were caused by interest rate increases. At September 30, 2019, the Company had 8 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at September 30, 2019.

At December 31, 2018, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:

(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	21,729	$	7	$	(222	)	$	21,514
Corporate debt		623		—		—			623
Total	$	22,352	$	7	$	(222	)	$	22,137

At December 31, 2018, the Company held $21.5 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipalities, and $0.6 million issued by corporations with investment grade ratings. Of that total, $4.8 million is classified as short-term investments on the Condensed Consolidated Balance Sheet as maturities are less than one-year, which also includes $8.1 million that is related to time deposits held with various financial institutions.

	Less than 12 Months					12 Months or More					Total
(in thousands)	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,866	$	(6	)	$	12,634	$	(216	)	$	18,500	$	(222	)
Corporate debt		457		—			100		—			557		—
Total	$	6,323	$	(6	)	$	12,734	$	(216	)	$	19,057	$	(222	)

The unrealized losses from corporate issuers were caused by interest rate increases. At December 31, 2018, the Company had 20 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at December 31, 2018.

The amortized cost and estimated fair value of the fixed maturity securities at September 30, 2019 by contractual maturity are set forth below:

(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	2,250	$	2,245
Due after one year through five years		27,933		28,137
Due after five years		—		—
Total	$	30,183	$	30,382

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2018 by contractual maturity are set forth below:

(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	4,768	$	4,743
Due after one year through five years		17,584		17,394
Due after five years		—		—
Total	$	22,352	$	22,137

The expected maturities in the foregoing table may differ from the contractual maturities because certain borrowers have the right to call or prepay obligations with or without penalty.

Proceeds from the sales and maturity of the Company’s investment in fixed maturity securities were $5.8 million. This along with maturing time deposits yielded total cash proceeds from the sale of investments of $8.4 million in the period of January 1, 2019 to September 30, 2019. These proceeds were used to purchase additional fixed maturity securities and time deposits. The gains and losses realized on those sales for the period from January 1, 2018 to September 30, 2019 were insignificant.

Realized gains and losses are reported on the Condensed Consolidated Statements of Income, with the cost of securities sold determined on a specific identification basis.

At September 30, 2019, investments with a fair value of approximately $4.8 million were on deposit with state insurance departments to satisfy regulatory requirements.

Reinsurance

9 Months Ended

Sep. 30, 2019

Reinsurance Disclosures [Abstract]

Reinsurance

NOTE 14 Reinsurance

Although the reinsurers are liable to the Company for amounts reinsured, our subsidiary, Wright National Flood Insurance Company (“Wright Flood”) remains primarily liable to its policyholders for the full amount of the policies written whether or not the reinsurers meet their obligations to the Company when they become due. The effects of reinsurance on premiums written and earned are as follows:

	Period from January 1, 2019 to September 30, 2019
(in thousands)	Written			Earned
Direct premiums	$	539,499		$	493,854
Ceded premiums		(539,489	)		(493,844	)
Net premiums	$	10		$	10

All premiums written by Wright Flood under the National Flood Insurance Program are 100% ceded to the Federal Emergency Management Agency, or FEMA, for which Wright Flood received a 30.0% expense allowance from January 1, 2019 through September 30, 2019. For the period from January 1, 2019 through September 30, 2019, the Company ceded $538.0 million of written premiums.

Effective April 1, 2014, Wright Flood is also a party to a quota share agreement whereby it cedes 100% of its gross excess flood premiums, excluding fees, to Arch Reinsurance Company and receives a 30.5% commission. Wright Flood ceded $1.5 million for the period from January 1, 2019 through September 30, 2019. As of September 30, 2019, no loss data exists on this agreement.

Wright Flood also ceded 100% of the homeowners, private passenger auto liability, and other liability occurrence to Stillwater Insurance Company, formerly known as Fidelity National Insurance Company. This business is in runoff. Therefore, only loss data exists on this business. As of September 30, 2019, no ceded unpaid losses and loss adjustment expenses or incurred but not reported expenses for homeowners, private passenger auto liability and other liability occurrence existed.

As of September 30, 2019 the Condensed Consolidated Balance Sheet contained reinsurance recoverable of $309.8 million and prepaid reinsurance premiums of $383.6 million. There was no net activity in the reserve for losses and loss adjustment expense during the period January 1, 2019 through September 30, 2019, as Wright Flood’s direct premiums written were 100% to two reinsurers. The balance of the reserve for losses and loss adjustment expense, excluding related reinsurance recoverable, as of September 30, 2019 was $309.8 million.

Basis of Financial Reporting (Policies)

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Accounting

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Standards

The impact of the adoption of Topic 842 on the balance sheet at January 1, 2019 was (in thousands):

(in thousands)	Balance at December 31, 2018		Adjustments due to Topic 842			Balance at January 1, 2019
Balance Sheet
Assets:
Other current assets		128,716		(3,004	)		125,712
Operating lease assets		—		178,304			178,304
Total Assets		6,688,668		175,300			6,863,968
Liabilities:
Accrued expenses and other liabilities		279,310		13,836			293,146
Operating lease liabilities		—		161,464			161,464
Total Liabilities		3,688,100		175,300			3,863,400

Basis of Financial Reporting (Tables)

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Impact of Adoption of Topic 842 on Balance Sheet

The impact of the adoption of Topic 842 on the balance sheet at January 1, 2019 was (in thousands):

(in thousands)	Balance at December 31, 2018		Adjustments due to Topic 842			Balance at January 1, 2019
Balance Sheet
Assets:
Other current assets		128,716		(3,004	)		125,712
Operating lease assets		—		178,304			178,304
Total Assets		6,688,668		175,300			6,863,968
Liabilities:
Accrued expenses and other liabilities		279,310		13,836			293,146
Operating lease liabilities		—		161,464			161,464
Total Liabilities		3,688,100		175,300			3,863,400

Revenues (Tables)

9 Months Ended

Sep. 30, 2019

Revenues [Abstract]

Schedule of Disaggregated by Revenue

The following tables present the revenues disaggregated by revenue source:

	Three months ended September 30, 2019
(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Other ⁽⁸⁾			Total
Base commissions ⁽¹⁾	$	248,488		$	92,224		$	68,162	$	—	$	—		$	408,874
Fees ⁽²⁾		65,501			44,984			15,850		50,069		(288	)		176,116
Incentive commissions ⁽³⁾		12,852			258			449		—		5			13,564
Profit-sharing contingent commissions ⁽⁴⁾		7,848			4,412			1,927		—		—			14,187
Guaranteed supplemental commissions ⁽⁵⁾		3,415			609			598		—		—			4,622
Investment income⁽⁶⁾		28			375			48		35		1,182			1,668
Other income, net ⁽⁷⁾		(420	)		(8	)		75		2		3			(348	)
Total Revenues	$	337,712		$	142,854		$	87,109	$	50,106	$	902		$	618,683

	Nine months ended September 30, 2019
(in thousands)	Retail		National Programs			Wholesale Brokerage		Services		Other ⁽⁸⁾			Total
Base commissions ⁽¹⁾	$	755,108	$	254,495		$	187,388	$	—	$	13		$	1,197,004
Fees ⁽²⁾		178,205		109,702			42,299		150,276		(863	)		479,619
Incentive commissions ⁽³⁾		68,342		(669	)		947		—		23			68,643
Profit-sharing contingent commissions ⁽⁴⁾		26,054		9,365			6,073		—		—			41,492
Guaranteed supplemental commissions ⁽⁵⁾		9,211		10,225			1,564		—		—			21,000
Investment income⁽⁶⁾		45		1,071			131		117		2,910			4,274
Other income, net ⁽⁷⁾		716		42			387		2		3			1,150
Total Revenues	$	1,037,681	$	384,231		$	238,789	$	150,395	$	2,086		$	1,813,182

(1)

(2)	Fee revenues relate to fees for services other than securing coverage for the Company's customers and fees negotiated in lieu of commissions.

(3)	Incentive commissions include additional commissions over base commissions received from insurance carriers based on predetermined production levels mutually agreed upon by both parties.

(4)	Profit-sharing contingent commissions are based primarily on underwriting results, but may also reflect considerations for volume, growth and/or retention.

(5)	Guaranteed supplemental commissions represent guaranteed fixed-base agreements in lieu of profit-sharing contingent commissions.

(6)	Investment income consists primarily of interest on cash and investments.

(7)	Other income consists primarily of legal settlements and other miscellaneous income.

(8)	Fees within other reflects the elimination of intercompany revenues.

Schedule of Balances of Contract Assets and Contract Liabilities Arising from Contracts with Customers

The balances of contract assets and contract liabilities arising from contracts with customers as of September 30, 2019 and December 31, 2018 were as follows:

(in thousands)	September 30, 2019		December 31, 2018
Contract assets	$	297,696	$	265,994
Contract liabilities	$	55,138	$	53,496

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Reconciliation between Basic and Diluted Weighted Average Shares Outstanding

The following is a reconciliation between basic and diluted weighted average shares outstanding:

	For the three months ended September 30,						For the nine months ended September 30,
(in thousands, except per share data)	2019			2018			2019			2018
Net income	$	115,506		$	106,053		$	321,995		$	270,803
Net income attributable to unvested awarded performance stock		(3,772	)		(2,716	)		(10,386	)		(6,185	)
Net income attributable to common shares	$	111,734		$	103,337		$	311,609		$	264,618
Weighted average number of common shares outstanding – basic		282,178			278,132			281,505			276,744
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic		(9,216	)		(7,124	)		(9,080	)		(6,321	)
Weighted average number of common shares outstanding for basic net income per common share		272,962			271,008			272,425			270,423
Dilutive effect of stock options		2,113			4,274			2,104			5,191
Weighted average number of shares outstanding – diluted		275,075			275,282			274,529			275,614
Net income per share:
Basic	$	0.41		$	0.38		$	1.14		$	0.98
Diluted	$	0.41		$	0.38		$	1.14		$	0.96

Business Combinations (Tables)

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions

(in thousands)
Name	Business segment	Effective date of acquisition	Cash paid		Common Stock Issued		Other payable		Recorded earn-out payable		Net assets acquired		Maximum potential earn- out payable
Smith Insurance Associates, Inc. (Smith)	Retail	February 1, 2019	$	20,129	$	—	$	—	$	2,704	$	22,833	$	4,550
Donald P. Pipino Company, LTD (Pipino)	Retail	February 1, 2019		16,420		—		135		9,821		26,376		12,996
Cossio Insurance Agency (Cossio)	Retail	March 1, 2019		13,990		—		10		1,710		15,710		2,000
Medval LLC (Medval)	Services	March 1, 2019		29,106		—		100		1,684		30,890		2,500
United Development Systems, Inc. (United)	Retail	May 1, 2019		18,987		—		388		3,268		22,643		8,625
Twinbrook Insurance Brokerage, Inc. (Twinbrook)	Retail	June 1, 2019		26,251		—		400		1,565		28,216		5,073
Innovative Risk Solutions, Inc. (IRS)	Retail	July 1, 2019		26,435		—		2,465		5,482		34,382		9,000
WBR Insurance Agency, LLC et al (WBR)	Retail	August 1, 2019		10,667		—		203		2,197		13,067		4,575
West Ridge Insurance Agency, Inc. d/b/a Yozell Associates (Yozell)	Retail	August 1, 2019		13,030		—		470		768		14,268		6,730
CKP Insurance, LLC (CKP)	Retail	August 1, 2019		89,190		20,000		4,000		38,093		151,283		76,500
Other	Various	Various		27,405		—		1,291		4,172		32,868		9,404
Total			$	291,610	$	20,000	$	9,462	$	71,464	$	392,536	$	141,953

Estimated Fair Values of Aggregate Assets and Liabilities Acquired

(in thousands)	Smith			Pipino			Cossio		Medval			United			Twinbrook			IRS			WBR			Yozell		CKP			Other			Total
Cash	$	—		$	—		$	—	$	3,217		$	—		$	—		$	—		$	—		$	—	$	—		$	—		$	3,217
Other current assets		473			819			17		1,708			477			—			1,200			169			1,473		8,900			(6,173	)		9,063
Fixed assets		39			112			29		50			20			85			11			10			12		193			(166	)		395
Goodwill		16,249			16,765			11,319		19,108			15,111			19,839			24,040			9,376			9,212		110,765			23,523			275,307
Purchased customer accounts		6,500			11,360			4,324		7,300			7,065			8,557			9,246			4,022			3,550		32,274			10,732			104,930
Non-compete agreements		41			11			21		1			11			12			11			34			21		21			128			312
Other assets		—			772			—		15			—			—			—			—			—		—			(732	)		55
Total assets acquired		23,302			29,839			15,710		31,399			22,684			28,493			34,508			13,611			14,268		152,153			27,312			393,279
Other current liabilities		(469	)		(3,463	)		—		(480	)		(41	)		(277	)		(126	)		(166	)		—		(870	)		5,556			(336	)
Other liabilities		—			—			—		(29	)		—			—			—			(378	)		—		—			—			(407	)
Total liabilities assumed		(469	)		(3,463	)		—		(509	)		(41	)		(277	)		(126	)		(544	)		—		(870	)		5,556			(743	)
Net assets acquired	$	22,833		$	26,376		$	15,710	$	30,890		$	22,643		$	28,216		$	34,382		$	13,067		$	14,268	$	151,283		$	32,868		$	392,536

Unaudited Proforma Results

These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.

(UNAUDITED)	Three months ended September 30,				Nine months ended September 30,
(in thousands, except per share data)	2019		2018		2019		2018
Total revenues	$	619,359	$	547,196	$	1,853,193	$	1,578,627
Income before income taxes	$	152,038	$	147,351	$	438,289	$	385,327
Net income	$	115,658	$	109,663	$	332,940	$	288,373
Net income per share:
Basic	$	0.41	$	0.39	$	1.18	$	1.04
Diluted	$	0.41	$	0.39	$	1.17	$	1.02
Weighted average number of shares outstanding:
Basic		272,962		271,008		272,425		270,423
Diluted		275,075		275,282		274,529		275,614

Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables

The resulting additions, payments, and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the nine months ended September 30, 2019 and 2018, were as follows:

	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2019			2018			2019			2018
Balance as of the beginning of the period	$	104,976		$	52,540		$	89,924		$	36,175
Additions to estimated acquisition earn-out payables		47,498			29,646			71,464			51,717
Payments for estimated acquisition earn-out payables		(601	)		(16,521	)		(7,865	)		(25,112	)
Subtotal		151,873			65,665			153,523			62,780
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables		(6,573	)		(928	)		(10,873	)		945
Interest expense accretion		1,303			571			3,953			1,583
Net change in earnings from estimated acquisition earn-out payables		(5,270	)		(357	)		(6,920	)		2,528
Balance as of September 30,	$	146,603		$	65,308		$	146,603		$	65,308

Goodwill (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Operating Segment

The changes in the carrying value of goodwill by reportable segment for the nine months ended September 30, 2019 are as follows:

(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Total
Balance as of December 31, 2018	$	2,063,150		$	926,206		$	291,622	$	151,808	$	3,432,786
Goodwill of acquired businesses		249,691			74			6,189		19,353		275,307
Goodwill disposed of relating to sales of businesses		(5,089	)		(739	)		—		—		(5,828	)
Balance as of September 30, 2019	$	2,307,752		$	925,541		$	297,811	$	171,161	$	3,702,265

Amortizable Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

Amortizable intangible assets at September 30, 2019 and December 31, 2018 consisted of the following:

	September 30, 2019									December 31, 2018
(in thousands)	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life (years) ₍₁₎		Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life (years) ₍₁₎
Purchased customer accounts	$	1,905,638	$	(985,436	)	$	920,202		15.0	$	1,804,404	$	(909,415	)	$	894,989		14.9
Non-compete agreements		33,781		(30,565	)		3,216		4.5		33,469		(29,651	)		3,818		4.5
Total	$	1,939,419	$	(1,016,001	)	$	923,418			$	1,837,873	$	(939,066	)	$	898,807

(1)	Weighted average life calculated as of the date of acquisition.

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt at September 30, 2019 and December 31, 2018 consisted of the following:

(in thousands)	September 30, 2019			December 31, 2018
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	40,000		$	35,000
Current portion of 5-year term loan facility expires 2023		15,000			15,000
Total current portion of long-term debt		55,000			50,000
Long-term debt:
Note agreements:
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	$	499,219		$	499,101
4.500% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2029		349,470			—
Total notes		848,689			499,101
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022		300,000			330,000
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022		100,000			350,000
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires December 21, 2023		273,750			285,000
Total credit agreements		673,750			965,000
Debt issuance costs (contra)		(8,879	)		(7,111	)
Total long-term debt less unamortized discount and debt issuance costs		1,513,560			1,456,990
Current portion of long-term debt		55,000			50,000
Total debt	$	1,568,560		$	1,506,990

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Schedule of Balances and Classification of Operating Lease Right-of-Use Assets and Operating Lease Liabilities within Condensed Consolidated Balance Sheet

The balances and classification of operating lease right-of-use assets and operating lease liabilities within the Condensed Consolidated Balance Sheet is as follows:

(in thousands)		September 30, 2019
Balance Sheet
Assets:
Operating lease right-of-use assets	Operating lease assets	$	193,419
Total Assets			193,419
Liabilities:
Current operating lease liabilities	Accrued expenses and other liabilities		41,828
Non-current operating lease liabilities	Operating lease liabilities		177,097
Total Liabilities		$	218,925

Schedule of Components of Lease Cost for Operating Leases

The components of lease cost for operating leases for the three and nine months ended September 30, 2019 were:

(in thousands)	Three months ended September 30, 2019			Nine months ended September 30, 2019
Operating leases:
Lease cost	$	11,581		$	36,671
Variable lease cost		1,197			2,701
Operating lease cost	$	12,778		$	39,372
Sublease income		(145	)		(329	)
Total lease cost net	$	12,633		$	39,043

Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rate for Operating Leases

The weighted average remaining lease term and the weighted average discount rate for operating leases as of September 30, 2019 were:

Weighted-average remaining lease term			6.10
Weighted-average discount rate			3.73

Schedule of Maturities of Operating Lease Liabilities

Maturities of the operating lease liabilities by fiscal year at September 30, 2019 for the Company's operating leases are as follows:

(in thousands)	Operating Leases
2019 (Remainder)	$	10,441
2020		50,613
2021		43,859
2022		36,448
2023		29,936
Thereafter		75,843
Total undiscounted lease payments		247,140
Less: Imputed interest		28,215
Present value of lease payments	$	218,925

Schedule of Aggregate Future Minimum Lease Payments under Non-cancelable Lease Agreements

At December 31, 2018, the aggregate future minimum lease payments under all non-cancelable lease agreements were as follows:

(in thousands)	December 31, 2018
2019	$	48,292
2020		43,517
2021		34,836
2022		27,035
2023		19,981
Thereafter		36,349
Total minimum future lease payments	$	210,010

Schedule of Supplemental Cash Flow Information

Supplemental cash flow information for operating leases:

(in thousands)	Three months ended September 30, 2019		Nine months ended September 30, 2019
Cash paid for amounts included in measurement of liabilities
Operating cash flows from operating leases	$	11,816	$	37,728
Right-of-use assets obtained in exchange for new operating liabilities	$	11,660	$	38,291

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities (Tables)

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Summary of Cash Paid for Interest and Income Taxes

Brown & Brown's cash paid during the period for interest and income taxes are summarized as follows:

	Nine months ended September 30,
(in thousands)	2019		2018
Cash paid during the period for:
Interest	$	52,127	$	32,896
Income taxes	$	85,970	$	21,380

Summary of Significant Non-Cash Investing and Financing Activities

Brown & Brown’s significant non-cash investing and financing activities are summarized as follows:

	Nine months ended September 30,
(in thousands)	2019		2018
Other payable issued for purchased customer accounts	$	9,462	$	3,339
Estimated acquisition earn-out payables and related charges	$	71,464	$	51,717
Notes received on the sale of fixed assets and customer accounts	$	9,903	$	—

Schedule of Reconciliation of Cash and Cash Equivalents Inclusive of Restricted Cash

The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of September 30, 2019 and 2018.

	Balance as of September 30,
(in thousands)	2019		2018
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	497,510	$	422,971
Restricted cash		377,085		301,716
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	874,595	$	724,687

The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2018 and 2017.

	Balance as of December 31,
(in thousands)	2018		2017
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	438,961	$	573,383
Restricted cash		338,635		250,705
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	777,596	$	824,088

Segment Information (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Summarized Financial Information Reportable Segments

	Three months ended September 30, 2019
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	337,712	$	142,854	$	87,109	$	50,106	$	902		$	618,683
Investment income	$	28	$	375	$	48	$	35	$	1,182		$	1,668
Amortization	$	15,821	$	6,264	$	2,797	$	1,390	$	—		$	26,272
Depreciation	$	1,897	$	1,779	$	422	$	315	$	1,402		$	5,815
Interest expense	$	22,287	$	3,557	$	1,105	$	1,164	$	(11,799	)	$	16,314
Income before income taxes	$	51,133	$	46,629	$	28,908	$	14,775	$	10,393		$	151,838
Total assets	$	6,155,670	$	3,315,656	$	1,406,709	$	469,292	$	(3,666,663	)	$	7,680,664
Capital expenditures	$	2,266	$	1,276	$	768	$	209	$	7,665		$	12,184

	Three months ended September 30, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	261,087	$	143,519	$	78,009	$	48,105	$	130		$	530,850
Investment income	$	1	$	138	$	44	$	51	$	485		$	719
Amortization	$	10,754	$	6,736	$	2,878	$	1,269	$	—		$	21,637
Depreciation	$	1,236	$	1,346	$	385	$	393	$	1,899		$	5,259
Interest expense	$	7,468	$	6,147	$	1,233	$	846	$	(6,731	)	$	8,963
Income before income taxes	$	61,224	$	46,707	$	23,614	$	6,988	$	3,967		$	142,500
Total assets	$	4,651,080	$	2,933,465	$	1,272,795	$	448,027	$	(3,502,561	)	$	5,802,806
Capital expenditures	$	1,467	$	2,420	$	895	$	366	$	4,321		$	9,469

	Nine months ended September 30, 2019
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	1,037,681	$	384,231	$	238,789	$	150,395	$	2,086		$	1,813,182
Investment income	$	45	$	1,071	$	131	$	117	$	2,910		$	4,274
Amortization	$	46,622	$	19,217	$	8,490	$	4,089	$	—		$	78,418
Depreciation	$	5,440	$	4,990	$	1,251	$	902	$	4,933		$	17,516
Interest expense	$	64,641	$	13,134	$	3,692	$	3,239	$	(36,901	)	$	47,805
Income before income taxes	$	189,191	$	106,188	$	67,421	$	33,220	$	27,860		$	423,880
Total assets	$	6,155,670	$	3,315,656	$	1,406,709	$	469,292	$	(3,666,663	)	$	7,680,664
Capital expenditures	$	7,810	$	7,786	$	2,470	$	540	$	28,752		$	47,358

	Nine months ended September 30, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	772,806	$	374,434	$	219,725	$	138,038	$	495		$	1,505,498
Investment income	$	2	$	384	$	125	$	160	$	1,380		$	2,051
Amortization	$	31,498	$	19,383	$	8,537	$	3,543	$	—		$	62,961
Depreciation	$	3,746	$	4,087	$	1,238	$	1,183	$	6,156		$	16,410
Interest expense	$	21,377	$	20,019	$	4,039	$	2,023	$	(18,772	)	$	28,686
Income before income taxes	$	175,984	$	91,809	$	55,544	$	23,889	$	14,625		$	361,851
Total assets	$	4,651,080	$	2,933,465	$	1,272,795	$	448,027	$	(3,502,561	)	$	5,802,806
Capital expenditures	$	5,828	$	7,313	$	1,762	$	798	$	13,158		$	28,859

Investments (Tables)

9 Months Ended

Sep. 30, 2019

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost and Fair Values of Fixed Maturity Securities

At September 30, 2019, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:

(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	24,854	$	183	$	(37	)	$	25,000
Corporate debt		5,329		63		(10	)		5,382
Total	$	30,183	$	246	$	(47	)	$	30,382

At December 31, 2018, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:

(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	21,729	$	7	$	(222	)	$	21,514
Corporate debt		623		—		—			623
Total	$	22,352	$	7	$	(222	)	$	22,137

Schedule of Investments' Gross Unrealized Loss and Fair Value

	Less than 12 Months					12 Months or More					Total
(in thousands)	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,435	$	(32	)	$	2,246	$	(5	)	$	7,681	$	(37	)
Corporate debt		997		(10	)		—		—			997		(10	)
Total	$	6,432	$	(42	)	$	2,246	$	(5	)	$	8,678	$	(47	)

	Less than 12 Months					12 Months or More					Total
(in thousands)	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,866	$	(6	)	$	12,634	$	(216	)	$	18,500	$	(222	)
Corporate debt		457		—			100		—			557		—
Total	$	6,323	$	(6	)	$	12,734	$	(216	)	$	19,057	$	(222	)

Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity

The amortized cost and estimated fair value of the fixed maturity securities at September 30, 2019 by contractual maturity are set forth below:

(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	2,250	$	2,245
Due after one year through five years		27,933		28,137
Due after five years		—		—
Total	$	30,183	$	30,382

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2018 by contractual maturity are set forth below:

(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	4,768	$	4,743
Due after one year through five years		17,584		17,394
Due after five years		—		—
Total	$	22,352	$	22,137

Reinsurance (Tables)

9 Months Ended

Sep. 30, 2019

Reinsurance Disclosures [Abstract]

Effects of Reinsurance on Premiums Written and Earned

The effects of reinsurance on premiums written and earned are as follows:

	Period from January 1, 2019 to September 30, 2019
(in thousands)	Written			Earned
Direct premiums	$	539,499		$	493,854
Ceded premiums		(539,489	)		(493,844	)
Net premiums	$	10		$	10

Basis of Financial Reporting - Schedule of Impact of adoption of Topic 842 on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets:
Other current assets	$ 133,443	$ 125,712	$ 128,716
Operating lease assets	193,419	178,304	0
Total Assets	7,680,664	6,863,968	6,688,668	$ 5,802,806
Liabilities:
Accrued expenses and other liabilities	272,166	293,146	279,310
Operating lease liabilities	$ 177,097	161,464	0
Total Liabilities		3,863,400	$ 3,688,100
Accounting Standards Update 2016-02
Assets:
Other current assets		(3,004)
Operating lease assets		178,304
Total Assets		175,300
Liabilities:
Accrued expenses and other liabilities		13,836
Operating lease liabilities		161,464
Total Liabilities		$ 175,300

Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	$ 1,668	$ 719	$ 4,274	$ 2,051
Other Income	(348)	318	1,150	1,228
Revenues	618,683	530,850	1,813,182	1,505,498
Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	1,182		2,910
Other Income	3		3
Revenues	902		2,086
Retail \| Operating Segments
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	28	1	45	2
Other Income	(420)		716
Revenues	337,712	261,087	1,037,681	772,806
National Programs \| Operating Segments
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	375	138	1,071	384
Other Income	(8)		42
Revenues	142,854	143,519	384,231	374,434
Wholesale Brokerage \| Operating Segments
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	48	44	131	125
Other Income	75		387
Revenues	87,109	78,009	238,789	219,725
Services \| Operating Segments
Disaggregation Of Revenue [Line Items]
Investment Income, Nonoperating	35	51	117	160
Other Income	2		2
Revenues	50,106	$ 48,105	150,395	$ 138,038
Core Commission Revenue
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	408,874		1,197,004
Core Commission Revenue \| Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other			13
Core Commission Revenue \| Retail
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	248,488		755,108
Core Commission Revenue \| National Programs
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	92,224		254,495
Core Commission Revenue \| Wholesale Brokerage
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	68,162		187,388
Core Commission Revenue \| Services
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	0		0
Fee Revenue
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	176,116		479,619
Fee Revenue \| Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	(288)		(863)
Fee Revenue \| Retail
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	65,501		178,205
Fee Revenue \| National Programs
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	44,984		109,702
Fee Revenue \| Wholesale Brokerage
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	15,850		42,299
Fee Revenue \| Services
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	50,069		150,276
Incentive Commissions Revenue
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	13,564		68,643
Incentive Commissions Revenue \| Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	5		23
Incentive Commissions Revenue \| Retail
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	12,852		68,342
Incentive Commissions Revenue \| National Programs
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	258		(669)
Incentive Commissions Revenue \| Wholesale Brokerage
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	449		947
Incentive Commissions Revenue \| Services
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	0		0
Profit-Sharing Contingent Commission Revenue
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	14,187		41,492
Profit-Sharing Contingent Commission Revenue \| Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	0		0
Profit-Sharing Contingent Commission Revenue \| Retail
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	7,848		26,054
Profit-Sharing Contingent Commission Revenue \| National Programs
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	4,412		9,365
Profit-Sharing Contingent Commission Revenue \| Wholesale Brokerage
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	1,927		6,073
Profit-Sharing Contingent Commission Revenue \| Services
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	0		0
Guaranteed Supplemental Commission Revenue
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	4,622		21,000
Guaranteed Supplemental Commission Revenue \| Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	0		0
Guaranteed Supplemental Commission Revenue \| Retail
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	3,415		9,211
Guaranteed Supplemental Commission Revenue \| National Programs
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	609		10,225
Guaranteed Supplemental Commission Revenue \| Wholesale Brokerage
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	598		1,564
Guaranteed Supplemental Commission Revenue \| Services
Disaggregation Of Revenue [Line Items]
Fees and Commissions, Other	$ 0		$ 0

Revenues - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Contract with Customer, Liability	$ 37.5	$ 37.0
Contract with Customer, Liability, Noncurrent	17.6	16.5
Deferred Revenue, Revenue Recognized	14.0
Deferred Costs	23.4	13.2
Cost to Obtain
Segment Reporting Information [Line Items]
Deferred Costs	11.6
Capitalized Contract Cost, Amortization	1.4
Cost to Fulfill
Segment Reporting Information [Line Items]
Deferred Costs	68.0	$ 69.8
Capitalized Contract Cost, Amortization	$ 1.9

Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 115,506	$ 92,593	$ 113,896	$ 106,053	$ 73,922	$ 90,828	$ 321,995	$ 270,803
Net income attributable to unvested awarded performance stock	(3,772)			(2,716)			(10,386)	(6,185)
Net income attributable to common shares	$ 111,734			$ 103,337			$ 311,609	$ 264,618
Weighted average number of common shares outstanding – basic	282,178			278,132			281,505	276,744
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(9,216)			(7,124)			(9,080)	(6,321)
Weighted average number of common shares outstanding for basic net income per common share	272,962			271,008			272,425	270,423
Dilutive effect of stock options	2,113			4,274			2,104	5,191
Weighted average number of shares outstanding – diluted	275,075			275,282			274,529	275,614
Basic (in dollars per share)	$ 0.41			$ 0.38			$ 1.14	$ 0.98
Diluted (in dollars per share)	$ 0.41			$ 0.38			$ 1.14	$ 0.96

Business Combinations - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) Acquisition	Sep. 30, 2018 USD ($) Acquisition	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Number of acquisitions \| Acquisition	18	18
Aggregate purchase price of acquisitions	$ (6,600)
Payments to Acquire Businesses, Gross	291,610
Net assets acquired	392,536
Goodwill, Acquired During Period	275,307
Goodwill currently deductible for income tax purposes	203,800
Goodwill related to the recorded earn-out payables	71,500
Total revenues related to acquisitions	31,000
Income before income taxes related to acquisitions	300
Estimated acquisition earn-out payables	146,603	$ 65,308	$ 104,976	$ 89,924	$ 52,540	$ 36,175
Maximum Future Contingency payments Acquisitions	310,600
Other Noncurrent Liabilities
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	122,900
Accounts payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	23,700
Retail
Business Acquisition [Line Items]
Goodwill, Acquired During Period	249,691
National Programs
Business Acquisition [Line Items]
Goodwill, Acquired During Period	74
Wholesale Brokerage
Business Acquisition [Line Items]
Goodwill, Acquired During Period	6,189
Services
Business Acquisition [Line Items]
Goodwill, Acquired During Period	19,353
Goodwill adjusted amount	$ 19,300
Purchased Customer Accounts
Business Acquisition [Line Items]
Weighted average life (years)	15 years
Non-compete Agreements
Business Acquisition [Line Items]
Weighted average life (years)	5 years
Business Combinations - Asset Deals
Business Acquisition [Line Items]
Number of acquisitions \| Acquisition	17
Business Combinations - Stock Deals
Business Acquisition [Line Items]
Number of acquisitions \| Acquisition	1
Other Acquisitions \| Maximum
Business Acquisition [Line Items]
Net assets acquired	$ 10,000

Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Business Combination Separately Recognized Transactions [Line Items]
Cash paid		$ 291,610
Common Stock Issued	$ 20,000	20,000
Other payable		9,462
Recorded earn-out payable	71,464	71,464
Net assets acquired	392,536	392,536
Maximum potential earn- out payable	141,953	141,953
Smith Insurance Associates, Inc. (Smith)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	22,833	$ 22,833
Smith Insurance Associates, Inc. (Smith) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Feb. 01, 2019
Cash paid		$ 20,129
Recorded earn-out payable	2,704	2,704
Net assets acquired	22,833	22,833
Maximum potential earn- out payable	4,550	4,550
Donald P. Pipino Company, LTD (Pipino)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	26,376	$ 26,376
Donald P. Pipino Company, LTD (Pipino) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Feb. 01, 2019
Cash paid		$ 16,420
Other payable		135
Recorded earn-out payable	9,821	9,821
Net assets acquired	26,376	26,376
Maximum potential earn- out payable	12,996	12,996
Cossio Insurance Agency (Cossio)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	15,710	$ 15,710
Cossio Insurance Agency (Cossio) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Mar. 01, 2019
Cash paid		$ 13,990
Other payable		10
Recorded earn-out payable	1,710	1,710
Net assets acquired	15,710	15,710
Maximum potential earn- out payable	2,000	2,000
Medval LLC (Medval)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	30,890	$ 30,890
Medval LLC (Medval) \| Services
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Mar. 01, 2019
Cash paid		$ 29,106
Other payable		100
Recorded earn-out payable	1,684	1,684
Net assets acquired	30,890	30,890
Maximum potential earn- out payable	2,500	2,500
United Development Systems, Inc. (United)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	22,643	$ 22,643
United Development Systems, Inc. (United) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		May 01, 2019
Cash paid		$ 18,987
Other payable		388
Recorded earn-out payable	3,268	3,268
Net assets acquired	22,643	22,643
Maximum potential earn- out payable	8,625	8,625
Twinbrook Insurance Brokerage, Inc. (Twinbrook)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	28,216	$ 28,216
Twinbrook Insurance Brokerage, Inc. (Twinbrook) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Jun. 01, 2019
Cash paid		$ 26,251
Other payable		400
Recorded earn-out payable	1,565	1,565
Net assets acquired	28,216	28,216
Maximum potential earn- out payable	5,073	5,073
Innovative Risk Solutions, Inc. (IRS)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	34,382	$ 34,382
Innovative Risk Solutions, Inc. (IRS) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Jul. 01, 2019
Cash paid		$ 26,435
Other payable		2,465
Recorded earn-out payable	5,482	5,482
Net assets acquired	34,382	34,382
Maximum potential earn- out payable	9,000	9,000
Other Acquisitions \| Various
Business Combination Separately Recognized Transactions [Line Items]
Cash paid		27,405
Other payable		1,291
Recorded earn-out payable	4,172	4,172
Net assets acquired	32,868	32,868
Maximum potential earn- out payable	9,404	9,404
WBR Insurance Agency, LLC et al (WBR)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	13,067	$ 13,067
WBR Insurance Agency, LLC et al (WBR) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Aug. 01, 2019
Cash paid		$ 10,667
Other payable		203
Recorded earn-out payable	2,197	2,197
Net assets acquired	13,067	13,067
Maximum potential earn- out payable	4,575	4,575
West Ridge Insurance Agency, Inc. d/b/a Yozell Associates (Yozell)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	14,268	$ 14,268
West Ridge Insurance Agency, Inc. d/b/a Yozell Associates (Yozell) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Aug. 01, 2019
Cash paid		$ 13,030
Other payable		470
Recorded earn-out payable	768	768
Net assets acquired	14,268	14,268
Maximum potential earn- out payable	6,730	6,730
CKP Insurance, LLC (CKP)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	151,283	$ 151,283
CKP Insurance, LLC (CKP) \| Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition		Aug. 01, 2019
Cash paid		$ 89,190
Common Stock Issued		20,000
Other payable		4,000
Recorded earn-out payable	38,093	38,093
Net assets acquired	151,283	151,283
Maximum potential earn- out payable	$ 76,500	$ 76,500

Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	$ 3,217
Other current assets	9,063
Fixed assets	395
Goodwill	275,307
Other assets	55
Total assets acquired	393,279
Other current liabilities	(336)
Other liabilities	(407)
Total liabilities assumed	(743)
Net assets acquired	392,536
Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	104,930
Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	312
Smith
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	473
Fixed assets	39
Goodwill	16,249
Total assets acquired	23,302
Other current liabilities	(469)
Total liabilities assumed	(469)
Net assets acquired	22,833
Smith \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	6,500
Smith \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	41
Pipino
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	819
Fixed assets	112
Goodwill	16,765
Other assets	772
Total assets acquired	29,839
Other current liabilities	(3,463)
Total liabilities assumed	(3,463)
Net assets acquired	26,376
Pipino \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	11,360
Pipino \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	11
Cossio
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	17
Fixed assets	29
Goodwill	11,319
Total assets acquired	15,710
Net assets acquired	15,710
Cossio \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	4,324
Cossio \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	21
Medval
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	3,217
Other current assets	1,708
Fixed assets	50
Goodwill	19,108
Other assets	15
Total assets acquired	31,399
Other current liabilities	(480)
Other liabilities	(29)
Total liabilities assumed	(509)
Net assets acquired	30,890
Medval \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	7,300
Medval \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	1
United
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	477
Fixed assets	20
Goodwill	15,111
Total assets acquired	22,684
Other current liabilities	(41)
Total liabilities assumed	(41)
Net assets acquired	22,643
United \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	7,065
United \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	11
Twinbrook
Fair Value Of Assets And Liabilities Statement [Line Items]
Fixed assets	85
Goodwill	19,839
Total assets acquired	28,493
Other current liabilities	(277)
Total liabilities assumed	(277)
Net assets acquired	28,216
Twinbrook \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	8,557
Twinbrook \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	12
IRS
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	1,200
Fixed assets	11
Goodwill	24,040
Total assets acquired	34,508
Other current liabilities	(126)
Total liabilities assumed	(126)
Net assets acquired	34,382
IRS \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	9,246
IRS \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	11
Other
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	(6,173)
Fixed assets	(166)
Goodwill	23,523
Other assets	(732)
Total assets acquired	27,312
Other current liabilities	5,556
Total liabilities assumed	5,556
Net assets acquired	32,868
Other \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	10,732
Other \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	128
WBR
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	169
Fixed assets	10
Goodwill	9,376
Total assets acquired	13,611
Other current liabilities	(166)
Other liabilities	(378)
Total liabilities assumed	(544)
Net assets acquired	13,067
WBR \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	4,022
WBR \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	34
Yozell
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	1,473
Fixed assets	12
Goodwill	9,212
Total assets acquired	14,268
Net assets acquired	14,268
Yozell \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	3,550
Yozell \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	21
CKP
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	8,900
Fixed assets	193
Goodwill	110,765
Total assets acquired	152,153
Other current liabilities	(870)
Total liabilities assumed	(870)
Net assets acquired	151,283
CKP \| Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	32,274
CKP \| Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	$ 21

Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Combinations [Abstract]
Total revenues	$ 619,359	$ 547,196	$ 1,853,193	$ 1,578,627
Income before income taxes	152,038	147,351	438,289	385,327
Net income	$ 115,658	$ 109,663	$ 332,940	$ 288,373
Net income per share:
Basic (in dollars per share)	$ 0.41	$ 0.39	$ 1.18	$ 1.04
Diluted (in dollars per share)	$ 0.41	$ 0.39	$ 1.17	$ 1.02
Weighted average number of shares outstanding:
Weighted Average Basic Shares Outstanding, Pro Forma	272,962	271,008	272,425	270,423
Pro Forma Weighted Average Shares Outstanding, Diluted	275,075	275,282	274,529	275,614

Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Combinations [Abstract]
Beginning balance	$ 104,976	$ 52,540	$ 89,924	$ 36,175
Additions to estimated acquisition earn-out payables	47,498	29,646	71,464	51,717
Payments for estimated acquisition earn-out payables	(601)	(16,521)	(7,865)	(25,112)
Subtotal	151,873	65,665	153,523	62,780
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	(6,573)	(928)	(10,873)	945
Interest expense accretion	1,303	571	3,953	1,583
Net change in earnings from estimated acquisition earn-out payables	(5,270)	(357)	(6,920)	2,528
Ending balance	$ 146,603	$ 65,308	$ 146,603	$ 65,308

Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill [Line Items]
Beginning balance	$ 3,432,786
Goodwill of acquired businesses	275,307
Goodwill disposed of relating to sales of businesses	(5,828)
Ending balance	3,702,265
Retail
Goodwill [Line Items]
Beginning balance	2,063,150
Goodwill of acquired businesses	249,691
Goodwill disposed of relating to sales of businesses	(5,089)
Ending balance	2,307,752
National Programs
Goodwill [Line Items]
Beginning balance	926,206
Goodwill of acquired businesses	74
Goodwill disposed of relating to sales of businesses	(739)
Ending balance	925,541
Wholesale Brokerage
Goodwill [Line Items]
Beginning balance	291,622
Goodwill of acquired businesses	6,189
Goodwill disposed of relating to sales of businesses	0
Ending balance	297,811
Services
Goodwill [Line Items]
Beginning balance	151,808
Goodwill of acquired businesses	19,353
Goodwill disposed of relating to sales of businesses	0
Ending balance	$ 171,161

Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 1,939,419	$ 1,837,873
Accumulated amortization	(1,016,001)	(939,066)
Net carrying value	923,418	898,807
Purchased Customer Accounts
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	1,905,638	1,804,404
Accumulated amortization	(985,436)	(909,415)
Net carrying value	$ 920,202	$ 894,989
Weighted average life (years)	15 years	14 years 10 months 24 days
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 33,781	$ 33,469
Accumulated amortization	(30,565)	(29,651)
Net carrying value	$ 3,216	$ 3,818
Weighted average life (years)	4 years 6 months	4 years 6 months

Amortizable Intangible Assets - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense estimated, year one (2019)	$ 104.7
Amortization expense estimated, year two (2020)	99.8
Amortization expense estimated, year three (2021)	96.3
Amortization expense estimated, year four (2022)	91.8
Amortization expense estimated, year five (2023)	$ 84.8

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total current portion of long-term debt	$ 55,000	$ 50,000
Total notes	848,689	499,101
Long-term credit agreements	673,750	965,000
Debt issuance costs (contra)	(8,879)	(7,111)
Total long-term debt less unamortized discount and debt issuance costs	1,513,560	1,456,990
Current portion of long-term debt	55,000	50,000
Total debt	1,568,560	1,506,990
5-year Term-Loan Facility Expires in 2022
Debt Instrument [Line Items]
Total current portion of long-term debt	40,000	35,000
Long-term credit agreements	300,000	330,000
5-year Term-Loan Facility Expires in 2023
Debt Instrument [Line Items]
Total current portion of long-term debt	15,000	15,000
Long-term credit agreements	273,750	285,000
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2024
Debt Instrument [Line Items]
Total notes	499,219	499,101
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029
Debt Instrument [Line Items]
Total notes	349,470
5-year Revolving-Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.500%, Plus Commitment Fees up to 0.250%, Expires June 28, 2022
Debt Instrument [Line Items]
Long-term credit agreements	$ 100,000	$ 350,000

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Maximum
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%
Minimum
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.00%
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2024
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.20%	4.20%
Debt instrument maturity year	2024	2024
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.50%
Debt instrument maturity year	2029
5-year Term-Loan Facility Expires in 2022
Debt Instrument [Line Items]
Debt instrument maturity year	2022	2022
Line of credit facility, expiration period	5 years	5 years
Line of credit facility, expiration date	Jun. 28, 2022	Jun. 28, 2022
5-year Term-Loan Facility Expires in 2022 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%	1.75%
5-year Revolving-Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.500%, Plus Commitment Fees up to 0.250%, Expires June 28, 2022
Debt Instrument [Line Items]
Line of credit facility, expiration period		5 years
Line of credit facility, expiration date		Jun. 28, 2022
5-year Revolving-Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.500%, Plus Commitment Fees up to 0.250%, Expires June 28, 2022 \| Maximum
Debt Instrument [Line Items]
Commitment fee, percentage		0.25%
5-year Revolving-Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.500%, Plus Commitment Fees up to 0.250%, Expires June 28, 2022 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate		1.50%
5-year Term-Loan Facility Expires in 2023
Debt Instrument [Line Items]
Debt instrument maturity year	2023	2023
Line of credit facility, expiration period	5 years	5 years
Line of credit facility, expiration date	Dec. 21, 2023	Dec. 21, 2023
5-year Term-Loan Facility Expires in 2023 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%	1.75%

Long-Term Debt - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Dec. 21, 2018	Dec. 31, 2018	Jun. 30, 2017	Sep. 30, 2019	Dec. 31, 2019	Mar. 31, 2019	Mar. 11, 2019	Nov. 15, 2018	Jun. 28, 2017	Sep. 18, 2014	Apr. 17, 2014
Debt Instrument [Line Items]
Unsecured revolving credit facility		$ 350,000,000.0		$ 100,000,000.0		$ 10,000,000.0		$ 600,000,000.0	$ 400,000,000.0		$ 800,000,000.0
Debt instrument, periodic payment, principal		365,000,000.0		10,000,000.0
Proceeds from issuance of debt		2,800,000
Write off of deferred debt issuance cost			$ 200,000
Debt issuance costs									$ 1,600,000
Unsecured term loans				340,000,000.0
Outstanding debt balance		1,506,990,000		$ 1,568,560,000
Debt instrument, periodic payment, principal	$ 250,000,000.0
LIBOR
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate				2.063%
Scenario Forecast [Member]
Debt Instrument [Line Items]
Long-term debt, scheduled principal payment					$ 3,800,000
Minimum
Debt Instrument [Line Items]
Debt instrument, variable interest rate				1.00%
Maximum
Debt Instrument [Line Items]
Debt instrument, variable interest rate				1.75%
Unsecured Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount										$ 500,000,000.0
Debt instrument interest rate stated percentage							4.50%			4.20%
Outstanding debt balance		500,000,000.0		$ 500,000,000.0		$ 350,000,000.0
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage				4.50%
Senior notes				$ 350,000,000.0			$ 350,000,000.0
Term Loan
Debt Instrument [Line Items]
Debt instrument, periodic payment, principal		67,500,000
Unsecured term loans	$ 300,000,000.0	$ 300,000,000.0		$ 288,800,000
Loan repayment term	5 years
Term Loan \| Minimum
Debt Instrument [Line Items]
Unsecured term loans	$ 300,000,000.0
Term Loan \| Maximum
Debt Instrument [Line Items]
Unsecured term loans	$ 450,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, outstanding amount										$ 475,000,000.0

Leases - Schedule of Balances and Classification of Operating Lease Right-of-Use Assets and Operating Lease Liabilities within Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets:
Operating lease right-of-use assets	$ 193,419	$ 178,304	$ 0
Total Assets	193,419
Liabilities:
Current operating lease liabilities	41,828
Non-current operating lease liabilities	177,097	$ 161,464	$ 0
Total Liabilities	$ 218,925

Leases - Schedule of Components of Lease Cost for Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Operating leases:
Lease cost	$ 11,581	$ 36,671
Variable lease cost	1,197	2,701
Operating lease cost	12,778	39,372
Sublease income	(145)	(329)
Total lease cost net	$ 12,633	$ 39,043

Leases - Schedule of Maturities of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019 (Remainder)	$ 10,441
2020	50,613
2021	43,859
2022	36,448
2023	29,936
Thereafter	75,843
Total undiscounted lease payments	247,140
Less: Imputed interest	28,215
Present value of lease payments	$ 218,925

Leases - Schedule of Aggregate Future Minimum Lease Payments under Non-cancelable Lease Agreements (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
2019	$ 48,292
2020	43,517
2021	34,836
2022	27,035
2023	19,981
Thereafter	36,349
Total minimum future lease payments	$ 210,010

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Schedule of Reconciliation of Cash and Cash Equivalents Inclusive of Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 497,510	$ 438,961	$ 422,971	$ 573,383
Restricted cash	377,085	338,635	301,716	250,705
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$ 874,595	$ 777,596	$ 724,687	$ 824,088

Segment Information - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment			4
Revenues	$ 618,683	$ 530,850	$ 1,813,182	$ 1,505,498
London, Bermuda and Cayman Islands
Segment Reporting Information [Line Items]
Revenues	$ 4,400	$ 3,700	$ 12,400	$ 11,300

Segment Information - Summarized Financial Information Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 618,683	$ 530,850	$ 1,813,182	$ 1,505,498
Investment income	1,668	719	4,274	2,051
Amortization	26,272	21,637	78,418	62,961
Depreciation	5,815	5,259	17,516	16,410
Interest expense	16,314	8,963	47,805	28,686
Income before income taxes	151,838	142,500	423,880	361,851
Total assets	7,680,664	5,802,806	7,680,664	5,802,806	$ 6,863,968	$ 6,688,668
Capital expenditures	12,184	9,469	47,358	28,859
Operating Segments \| Retail
Segment Reporting Information [Line Items]
Revenues	337,712	261,087	1,037,681	772,806
Investment income	28	1	45	2
Amortization	15,821	10,754	46,622	31,498
Depreciation	1,897	1,236	5,440	3,746
Interest expense	22,287	7,468	64,641	21,377
Income before income taxes	51,133	61,224	189,191	175,984
Total assets	6,155,670	4,651,080	6,155,670	4,651,080
Capital expenditures	2,266	1,467	7,810	5,828
Operating Segments \| National Programs
Segment Reporting Information [Line Items]
Revenues	142,854	143,519	384,231	374,434
Investment income	375	138	1,071	384
Amortization	6,264	6,736	19,217	19,383
Depreciation	1,779	1,346	4,990	4,087
Interest expense	3,557	6,147	13,134	20,019
Income before income taxes	46,629	46,707	106,188	91,809
Total assets	3,315,656	2,933,465	3,315,656	2,933,465
Capital expenditures	1,276	2,420	7,786	7,313
Operating Segments \| Wholesale Brokerage
Segment Reporting Information [Line Items]
Revenues	87,109	78,009	238,789	219,725
Investment income	48	44	131	125
Amortization	2,797	2,878	8,490	8,537
Depreciation	422	385	1,251	1,238
Interest expense	1,105	1,233	3,692	4,039
Income before income taxes	28,908	23,614	67,421	55,544
Total assets	1,406,709	1,272,795	1,406,709	1,272,795
Capital expenditures	768	895	2,470	1,762
Operating Segments \| Services
Segment Reporting Information [Line Items]
Revenues	50,106	48,105	150,395	138,038
Investment income	35	51	117	160
Amortization	1,390	1,269	4,089	3,543
Depreciation	315	393	902	1,183
Interest expense	1,164	846	3,239	2,023
Income before income taxes	14,775	6,988	33,220	23,889
Total assets	469,292	448,027	469,292	448,027
Capital expenditures	209	366	540	798
Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	902	130	2,086	495
Investment income	1,182	485	2,910	1,380
Amortization	0	0	0	0
Depreciation	1,402	1,899	4,933	6,156
Interest expense	(11,799)	(6,731)	(36,901)	(18,772)
Income before income taxes	10,393	3,967	27,860	14,625
Total assets	(3,666,663)	(3,502,561)	(3,666,663)	(3,502,561)
Capital expenditures	$ 7,665	$ 4,321	$ 28,752	$ 13,158

Investments - Summary of Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost	$ 30,183	$ 22,352
Gross Unrealized Gains	246	7
Gross Unrealized Losses	(47)	(222)
Fair Value	30,382	22,137
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Debt Securities, Available-for-sale [Line Items]
Cost	24,854	21,729
Gross Unrealized Gains	183	7
Gross Unrealized Losses	(37)	(222)
Fair Value	25,000	21,514
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Cost	5,329	623
Gross Unrealized Gains	63	0
Gross Unrealized Losses	(10)	0
Fair Value	$ 5,382	$ 623

Investments - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) Security	Dec. 31, 2018 USD ($) Security
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 30,382	$ 22,137
Number of securities in unrealized loss position \| Security	8	20
Proceeds from sale of investment in fixed maturity securities	$ 5,800
Proceeds from Sale of Other Investments	8,400
Investments on deposit with the state insurance department	4,800
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	25,000	$ 21,514
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	2,200	4,800
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities \| Bank Time Deposits
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	7,700	8,100
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 5,382	$ 623

Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 6,432	$ 6,323
Unrealized Losses, Less than 12 Months	(42)	(6)
Fair Value, 12 Months or More	2,246	12,734
Unrealized Losses, 12 Months or More	(5)	(216)
Fair Value	8,678	19,057
Unrealized Losses	(47)	(222)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	5,435	5,866
Unrealized Losses, Less than 12 Months	(32)	(6)
Fair Value, 12 Months or More	2,246	12,634
Unrealized Losses, 12 Months or More	(5)	(216)
Fair Value	7,681	18,500
Unrealized Losses	(37)	(222)
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	997	457
Unrealized Losses, Less than 12 Months	(10)	0
Fair Value, 12 Months or More	0	100
Unrealized Losses, 12 Months or More	0	0
Fair Value	997	557
Unrealized Losses	$ (10)	$ 0

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Due in one year or less	$ 2,250	$ 4,768
Due after one year through five years	27,933	17,584
Due after five years	0	0
Amortized Cost, Total	30,183	22,352
Fair value
Due in one year or less	2,245	4,743
Due after one year through five years	28,137	17,394
Due after five years	0	0
Fair Value, Total	$ 30,382	$ 22,137

Reinsurance - Effects of Reinsurance on Premiums Written and Earned (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Written
Direct premiums	$ 539,499
Ceded premiums	(539,489)
Net premiums	10
Earned
Direct premiums	493,854
Ceded premiums	(493,844)
Net premiums	$ 10

Reinsurance - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) Reinsurer	Dec. 31, 2018 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Premiums written net	$ 539,489
Ceded unpaid loss	309,800
Prepaid reinsurance premiums	383,565	$ 337,920
Reserve for losses and loss adjustment expense	$ 309,800
Number of reinsurers \| Reinsurer	2
Wright National Flood Insurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Expenses and allowance rate received in premiums	30.00%
Premiums written net	$ 538,000
Wright National Flood Insurance Company \| Quota Share Agreement
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Effective cedes rate under quota share agreement	100.00%
Commission rate, percent of ceded written premiums	30.50%
Ceded amount	$ 1,500

Statutory Financial Information - Additional Information (Details) - Wright Flood - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	$ 7,500,000
Statutory capital and surplus	28,900,000	$ 19,400,000
Statutory net Income	$ 8,100,000	$ 4,500,000

Basis of Financial Reporting - Additional Information (Details) $ in Millions	Jan. 01, 2019 USD ($)
Accounting Standards Update 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 202.9

Subsidiary Dividend Restrictions - Additional Information (Details) - Wright Flood $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Dividend Restrictions [Line Items]
Preferred stock, dividend rate, percentage	100.00%
Maximum dividend payout that may be made without prior approval	$ 4.5
Maximum
Dividend Restrictions [Line Items]
Preferred stock, dividend rate, percentage	10.00%

Shareholders' Equity - Additional Information (Details)	Sep. 30, 2019 USD ($) shares
Second Accelerated Share Repurchase Agreement \| Maximum
Accelerated Share Repurchases [Line Items]
Shares repurchased, authorized amount	$ 100,000,000.0
Third Accelerated Share Repurchase Agreement
Accelerated Share Repurchases [Line Items]
Shares repurchased, authorized amount	$ 9,700,000
Shares repurchased, authorized shares \| shares	274,981
Accelerated Share Repurchase Agreement
Accelerated Share Repurchases [Line Items]
Stock repurchase program, remaining authorized repurchase amount	$ 490,200,000

Nature of Operations - Additional Information (Details)	9 Months Ended
Nature of Operations - Additional Information (Details)	Sep. 30, 2019 Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of reportable segments	4

Revenues - Schedule of Balances of Contract Assets and Contract Liabilities Arising from contracts with Customers (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenues [Abstract]
Contract assets	$ 297,696	$ 265,994
Contract liabilities	$ 55,138	$ 53,496

Leases - Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rate for Operating Leases (Details)	Sep. 30, 2019
Leases [Abstract]
Weighted-average remaining lease term	6 years 1 month 6 days
Weighted-average discount rate	3.73%

Leases - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Cash paid for amounts included in measurement of liabilities
Operating cash flows from operating leases	$ 11,816	$ 37,728
Right-of-use assets obtained in exchange for new operating liabilities	$ 11,660	$ 38,291

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Cash Paid for Interest and Income Taxes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash paid during the period for:
Interest	$ 52,127	$ 32,896
Income taxes	$ 85,970	$ 21,380

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	$ 9,462	$ 3,339
Estimated acquisition earn-out payables and related charges	71,464	$ 51,717
Notes received on the sale of fixed assets and customer accounts	$ 9,903