Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES
Commissions and fees	$ 289,942	$ 245,983	$ 586,475	$ 507,435
Investment income	187	393	322	617
Other income, net	787	440	6,605	992
Total revenues	290,916	246,816	593,402	509,044
EXPENSES
Employee compensation and benefits	150,752	125,852	300,348	252,409
Non-cash stock-based compensation	3,738	2,709	7,485	5,482
Other operating expenses	42,220	34,979	85,620	71,055
Amortization	15,881	13,556	31,494	27,065
Depreciation	3,784	3,079	7,425	6,214
Interest	4,000	3,608	8,087	7,215
Change in estimated acquisition earn-out payables	(604)	1,565	(992)	1,466
Total expenses	219,771	185,348	439,467	370,906
Income before income taxes	71,145	61,468	153,935	138,138
Income taxes	28,674	24,433	62,031	54,810
Net income	$ 42,471	$ 37,035	$ 91,904	$ 83,328
Net income per share:
Basic	$ 0.30	$ 0.26	$ 0.64	$ 0.58
Diluted	$ 0.29	$ 0.26	$ 0.63	$ 0.57
Weighted average number of shares outstanding:
Basic	139,086	138,379	139,044	138,365
Diluted	141,828	139,942	141,664	140,950
Dividends declared per share	$ 0.0850	$ 0.0800	$ 0.1700	$ 0.1600