CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 184,045	$ 163,995	$ 161,752
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	63,573	54,755	51,442
Depreciation	15,373	12,392	12,639
Non-cash stock-based compensation	15,865	11,194	6,845
Change in estimated acquisition earn-out payables	1,418	(2,206)	(1,674)
Deferred income taxes	32,723	30,328	22,587
Income tax benefit from exercise of shares from the stock benefit plans	(8,659)	(916)	(11,391)
Net gain on sales of investments, fixed assets and customer accounts	(4,105)	(1,890)	(1,474)
Payments on acquisition earn-outs in excess of original estimated payables	(4,086)	(1,369)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments (increase) decrease	(34,029)	(6,941)	31,663
Premiums, commissions and fees receivable (increase)	(11,312)	(20,570)	(2,555)
Other assets decrease (increase)	2,145	(7,322)	14,529
Premiums payable to insurance companies (decrease) increase	(4,651)	9,447	436
Premium deposits and credits due customers increase (decrease)	2,506	1,277	(9,673)
Accounts payable increase (decrease)	36,505	(2,807)	28,246
Accrued expenses and other liabilities (decrease) increase	(43,059)	3,975	(2,087)
Other liabilities (decrease)	(23,937)	(5,811)	(5,233)
Net cash provided by operating activities	220,315	237,531	296,052
Cash flows from investing activities:
Additions to fixed assets	(24,028)	(13,608)	(10,454)
Payments for businesses acquired, net of cash acquired	(425,054)	(166,055)	(157,637)
Proceeds from sales of fixed assets and customer accounts	14,095	3,686	1,558
Purchases of investments	(11,167)	(12,698)	(9,285)
Proceeds from sales of investments	10,654	12,950	9,327
Net cash used in investing activities	(435,500)	(175,725)	(166,491)
Cash flows from financing activities:
Payments on acquisition earn-outs	(13,539)	(8,843)	(2,136)
Proceeds from long-term debt	200,000	100,000
Payments on long-term debt	(1,227)	(102,072)	(19,425)
Borrowings on revolving credit facilities	100,000
Payments on revolving credit facilities	(100,000)
Income tax benefit from exercise of shares from the stock benefit plans	8,659	916	11,391
Issuances of common stock for employee stock benefit plans	13,305	8,667	11,119
Repurchase of stock benefit plan shares for employee to fund tax withholdings	(8,963)	(659)	(10,143)
Cash dividends paid	(49,534)	(46,494)	(44,496)
Net cash provided by (used in) financing activities	148,701	(48,485)	(53,690)
Net (decrease) increase in cash and cash equivalents	(66,484)	13,321	75,871
Cash and cash equivalents at beginning of year	286,305	272,984	197,113
Cash and cash equivalents at end of year	$ 219,821	$ 286,305	$ 272,984