Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Commissions and fees	$ 106,453	$ 108,868	$ 214,877	$ 211,876
Recurring	24,975	26,283	50,552	51,623
Other	7,038	4,142	10,646	7,844
Total revenues	138,466	139,293	276,075	271,343
Expenses:
Compensation and employee benefits	52,720	51,202	103,897	100,751
Transaction processing	20,109	22,499	40,605	44,031
Occupancy and equipment	14,985	20,720	30,063	37,261
Telecommunications and data processing services	12,655	13,718	25,352	27,816
Other general and administrative	20,715	19,760	39,820	38,536
Restructuring charges		(75)		(75)
Interest expense	594	699	1,230	1,301
Total expenses	121,778	128,523	240,967	249,621
Income before income tax expense	16,688	10,770	35,108	21,722
Income tax expense	3,762	5,684	8,562	8,014
Net income	$ 12,926	$ 5,086	$ 26,546	$ 13,708
Income per share:
Basic (in dollars per share)	$ 0.36	$ 0.14	$ 0.74	$ 0.37
Diluted (in dollars per share)	$ 0.35	$ 0.13	$ 0.72	$ 0.36
Basic weighted average number of common shares outstanding (in shares)	35,720	36,956	35,900	37,166
Diluted weighted average number of common shares outstanding (in shares)	36,641	38,000	36,933	38,371