Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues
Commissions	$ 44,902	$ 37,785
Technology products and services	2,908	3,108
Information and user access fees	1,871	1,689
Investment income	303	299
Other	751	728
Total revenues	50,735	43,609
Expenses
Employee compensation and benefits	15,841	16,268
Depreciation and amortization	1,854	1,562
Technology and communications	2,955	2,500
Professional and consulting fees	3,024	2,872
Occupancy	759	766
Marketing and advertising	1,447	974
General and administrative	2,107	1,001
Total expenses	27,987	25,943
Income before income taxes	22,748	17,666
Provision for income taxes	9,255	6,886
Net income	$ 13,493	$ 10,780
Net income per common share
Basic	$ 0.37	$ 0.30
Diluted	$ 0.35	$ 0.27
Cash dividends declared per common share	$ 0.11	$ 0.09
Weighted average shares outstanding
Basic	36,934	36,507
Diluted	38,695	39,301