CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 60,131	$ 49,433
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	16,161	15,613
Depreciation	4,167	3,641
Non-cash stock-based compensation	3,850	3,747
Change in estimated acquisition earn-out payables	1,522	(388)
Deferred income taxes	15,620	18,435
Income tax benefit from exercise of shares from the stock benefit plans	(252)	(29)
Net gain on sales of investments, fixed assets and customer accounts	(383)	(2,988)
Payments on acquisition earn-outs in excess of original estimated payables	(1,618)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments (increase)	(22,204)	(58,984)
Premiums, commissions and fees receivable decrease (increase)	262	(6,491)
Other assets decrease	12,919	1,858
Premiums payable to insurance companies increase	36,586	28,897
Premium deposits and credits due customers (decrease) increase	(7,524)	1,056
Accounts payable increase	19,308	22,484
Accrued expenses and other liabilities increase (decrease)	5,788	(37,221)
Other liabilities (decrease)	(7,312)	(13,275)
Net cash provided by operating activities	137,021	25,788
Cash flows from investing activities:
Additions to fixed assets	(2,947)	(5,905)
Payments for businesses acquired, net of cash acquired	(61)	(341,758)
Proceeds from sales of fixed assets and customer accounts	243	4,103
Purchases of investments	(1,629)	(1,308)
Proceeds from sales of investments	2,585	1,328
Net cash used in investing activities	(1,809)	(343,540)
Cash flows from financing activities:
Payments on acquisition earn-outs	(2,701)	(133)
Proceeds from long-term debt		200,000
Payments on long-term debt		(614)
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	252	29
Issuances of common stock for employee stock benefit plans	625	287
Repurchase stock benefit plan shares for employees to fund tax withholdings	(50)	(224)
Cash dividends paid	(12,953)	(12,184)
Net cash (used in) provided by financing activities	(14,827)	187,161
Net increase (decrease) in cash and cash equivalents	120,385	(130,591)
Cash and cash equivalents at beginning of period	219,821	286,305
Cash and cash equivalents at end of period	$ 340,206	$ 155,714