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