Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 49,433	$ 46,293
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	15,613	13,509
Depreciation	3,641	3,135
Non-cash stock-based compensation	3,747	2,773
Change in estimated acquisition earn-out payables	(388)	(99)
Deferred income taxes	18,435	18,520
Income tax benefit from exercise of shares from the stock benefit plans	(29)	(91)
Net gain on sales of investments, fixed assets and customer accounts	(2,988)	(160)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments (increase) decrease	(58,984)	7,959
Premiums, commissions and fees receivable (increase)	(6,491)	(18,012)
Other assets decrease (increase)	1,858	(12,106)
Premiums payable to insurance companies increase	28,897	19,022
Premium deposits and credits due customers increase	1,056	3,031
Accounts payable increase (decrease)	22,484	(1,871)
Accrued expenses and other liabilities (decrease)	(37,221)	(30,202)
Other liabilities (decrease)	(13,275)	(97)
Net cash provided by operating activities	25,788	51,604
Cash flows from investing activities:
Additions to fixed assets	(5,905)	(2,917)
Payments for businesses acquired, net of cash acquired	(341,758)	(43,855)
Proceeds from sales of fixed assets and customer accounts	4,103	126
Purchases of investments	(1,308)	(3,065)
Proceeds from sales of investments	1,328	3,259
Net cash used in investing activities	(343,540)	(46,452)
Cash flows from financing activities:
Payments on acquisition earn-outs	(133)	(358)
Proceeds from long-term debt	200,000
Payments on long-term debt	(614)	(1,099)
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	29	91
Issuances of common stock for employee stock benefit plans	287	316
Repurchase stock benefit plan shares for employees to fund tax withholdings	(224)	(4)
Cash dividends paid	(12,184)	(11,400)
Net cash provided by (used in) financing activities	187,161	(12,454)
Net (decrease) in cash and cash equivalents	(130,591)	(7,302)
Cash and cash equivalents at beginning of period	286,305	272,984
Cash and cash equivalents at end of period	$ 155,714	$ 265,682