CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 185,383	$ 182,501
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	65,406	60,482
Depreciation	15,635	15,338
Non-cash stock-based compensation	17,348	19,149
Change in estimated acquisition earn-out payables	2,194	6,574
Deferred income taxes	16,974	17,200
Amortization of debt discount	118	0
Income tax benefit from exercise of shares from the stock benefit plans	(2,502)	(2,983)
Payments On Acquisition Earn Outs In Excess Of Original Estimated Payables	4,917	2,539
Net gain on sales of investments, fixed assets and customer accounts	(830)	(2,654)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments decrease (increase)	42,123	(25,837)
Premiums, commissions and fees receivable decrease	2,277	21,078
Reinsurance recoverables (increase) decrease	(24,177)	2,052
Prepaid reinsurance premiums (increase)	(9,191)	(56,923)
Other assets (increase)	(13,076)	(4,957)
Premiums payable to insurance companies decrease	(37,845)	(24,749)
Premium deposits and credits due customers increase	12,717	18,504
Losses and loss adjustment reserve increase (decrease)	24,177	(2,052)
Unearned premiums increase	9,191	56,923
Accounts payable increase	27,793	26,375
Accrued expenses and other liabilities (decrease) increase	(11,547)	321
Other liabilities (decrease)	(26,610)	(18,453)
Net cash provided by operating activities	290,641	285,350
Cash flows from investing activities:
Additions to fixed assets	(12,773)	(20,189)
Payments for businesses acquired, net of cash acquired	(109,926)	(694,816)
Proceeds from sales of fixed assets and customer accounts	4,794	3,392
Purchases and proceeds from sales of investments	(2,415)	(89)
Net cash used in investing activities	(120,320)	(711,702)
Cash flows from financing activities:
Payments on acquisition earn-outs	(22,020)	(9,353)
Proceeds from Issuance of Long-term Debt	0	1,048,432
Payments on long-term debt	(38,750)	(330,000)
Income tax benefit from exercise of shares from the stock benefit plans	2,502	2,983
Issuances of common stock for employee stock benefit plans	15,854	14,753
Repurchase stock benefit plan shares for employees to fund tax withholdings	(2,297)	(2,751)
Purchase of treasury stock	(100,000)	(67,525)
Prepayment of accelerated share repurchase program	0	(7,500)
Cash dividends paid	(46,840)	(43,547)
Net cash (used in) provided by financing activities	(191,551)	605,492
Net (decrease) increase in cash and cash equivalents	(21,230)	179,140
Cash and cash equivalents at beginning of period	470,048	202,952
Cash and cash equivalents at end of period	448,818	382,092
Proceeds from Lines of Credit	0	475,000
Repayments of Lines of Credit	$ 0	$ 475,000