Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
REVENUES
Commissions and fees	$ 302,310	$ 257,177	$ 888,785	$ 764,612
Investment income	239	317	561	934
Other income, net	1,251	2,907	7,856	3,899
Total revenues	303,800	260,401	897,202	769,445
EXPENSES
Employee compensation and benefits	149,691	126,877	450,039	379,286
Non-cash stock-based compensation	3,908	2,856	11,393	8,338
Other operating expenses	43,774	38,434	129,394	109,489
Amortization	15,956	13,725	47,450	40,790
Depreciation	3,958	3,062	11,383	9,276
Interest	4,006	3,565	12,093	10,780
Change in estimated acquisition earn-out payables	858	(810)	(134)	656
Total expenses	222,151	187,709	661,618	558,615
Income before income taxes	81,649	72,692	235,584	210,830
Income taxes	32,145	28,519	94,176	83,329
Net income	$ 49,504	$ 44,173	$ 141,408	$ 127,501
Net income per share:
Basic	$ 0.34	$ 0.31	$ 0.99	$ 0.89
Diluted	$ 0.34	$ 0.30	$ 0.97	$ 0.88
Weighted average number of shares outstanding:
Basic	139,465	138,690	139,185	138,475
Diluted	142,097	140,443	141,769	140,120
Dividends declared per share	$ 0.0850	$ 0.0800	$ 0.2550	$ 0.2400