Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Commissions and fees	$ 102,900	$ 98,378	$ 317,777	$ 310,254
Recurring	26,452	25,761	77,004	77,384
Other	5,421	3,419	16,067	11,263
Total revenues	134,773	127,558	410,848	398,901
Expenses:
Compensation and employee benefits	52,408	49,664	156,305	150,415
Transaction processing	21,561	19,790	62,166	63,821
Occupancy and equipment	14,937	15,821	45,000	53,082
Telecommunications and data processing services	12,942	12,649	38,294	40,465
Other general and administrative	20,281	18,351	60,101	56,887
Restructuring charges				(75)
Interest expense	566	593	1,796	1,894
Total expenses	122,695	116,868	363,662	366,489
Income (loss) before income tax expense (benefit)	12,078	10,690	47,186	32,412
Income tax expense (benefit)	713	2,975	9,275	10,989
Net income (loss)	$ 11,365	$ 7,715	$ 37,911	$ 21,423
Income per share:
Basic (in dollars per share)	$ 0.32	$ 0.21	$ 1.06	$ 0.58
Diluted (in dollars per share)	$ 0.32	$ 0.20	$ 1.04	$ 0.56
Basic weighted average number of common shares outstanding (in shares)	35,093	36,544	35,628	36,956
Diluted weighted average number of common shares outstanding (in shares)	36,026	37,781	36,599	38,214