CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES
Commissions and fees	$ 1,189,081	$ 1,005,962	$ 966,917
Investment income	797	1,267	1,326
Other income, net	10,154	6,313	5,249
Total revenues	1,200,032	1,013,542	973,492
EXPENSES
Employee compensation and benefits	608,506	508,675	487,820
Non-cash stock-based compensation	15,865	11,194	6,845
Other operating expenses	174,389	144,079	135,851
Amortization	63,573	54,755	51,442
Depreciation	15,373	12,392	12,639
Interest	16,097	14,132	14,471
Change in estimated acquisition earn-out payables	1,418	(2,206)	(1,674)
Total expenses	895,221	743,021	707,394
Income before income taxes	304,811	270,521	266,098
Income taxes	120,766	106,526	104,346
Net income	$ 184,045	$ 163,995	$ 161,752
Net income per share:
Basic	$ 1.28	$ 1.15	$ 1.14
Diluted	$ 1.26	$ 1.13	$ 1.12
Weighted average number of shares outstanding:
Basic	139,364	138,582	137,924
Diluted	142,010	140,264	139,318
Dividends declared per share	$ 0.3450	$ 0.3250	$ 0.3125