CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 112,138	$ 91,904
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	32,282	31,494
Depreciation	8,430	7,425
Non-cash stock-based compensation	7,473	7,485
Change in estimated acquisition earn-out payables	2,178	(992)
Deferred income taxes	20,922	25,385
Income tax benefit from exercise of shares from the stock benefit plans	(307)	(55)
Net gain on sales of investments, fixed assets and customer accounts	(974)	(2,361)
Payments on acquisition earn-outs in excess of original estimated payables	(1,926)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments (increase)	(45,974)	(62,005)
Premiums, commissions and fees receivable (increase)	(6,307)	(6,355)
Other assets (increase)	(1,386)	(9,747)
Premiums payable to insurance companies increase	69,008	50,028
Premium deposits and credits due customers (decrease)	(1,651)	(854)
Accounts payable increase	6,725	33,269
Accrued expenses and other liabilities increase (decrease)	27,517	(27,969)
Other liabilities (decrease)	(6,263)	(23,903)
Net cash provided by operating activities	221,885	112,749
Cash flows from investing activities:
Additions to fixed assets	(7,123)	(12,677)
Payments for businesses acquired, net of cash acquired	(14,384)	(369,733)
Proceeds from sales of fixed assets and customer accounts	513	4,504
Purchases of investments	(9,935)	(3,147)
Proceeds from sales of investments	5,914	3,084
Net cash used in investing activities	(25,015)	(377,969)
Cash flows from financing activities:
Payments on acquisition earn-outs	(6,153)	(1,645)
Proceeds from long-term debt		200,000
Payments on long-term debt	(60)	(624)
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	307	55
Issuances of common stock for employee stock benefit plans	725	288
Repurchase stock benefit plan shares for employees to fund tax withholdings	(73)	(1,084)
Cash dividends paid	(25,912)	(24,363)
Net cash (used in) provided by financing activities	(31,166)	172,627
Net increase (decrease) in cash and cash equivalents	165,704	(92,593)
Cash and cash equivalents at beginning of period	219,821	286,305
Cash and cash equivalents at end of period	$ 385,525	$ 193,712