Supplementary Financial Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplementary Financial Information (unaudited)
Total revenues	$ 129,923	$ 149,419	$ 142,617	$ 150,078	$ 138,346	$ 130,396	$ 155,322	$ 146,690	$ 572,037	$ 570,754	$ 633,069
Expenses:
Compensation and employee benefits	52,041	54,109	55,679	57,478	57,208	50,627	54,587	53,464	219,307	215,886	235,518
Transaction processing	20,632	24,840	23,104	23,026	21,746	19,401	23,581	20,659	91,602	85,387	95,618
Occupancy and equipment	15,282	14,904	15,063	14,942	15,316	14,423	14,969	15,197	60,191	59,905	59,950
Telecommunications and data processing services	13,960	14,559	14,870	15,071	14,108	12,759	12,971	13,635	58,460	53,473	54,549
Other general and administrative	22,705	23,181	22,762	22,160	22,516	21,652	21,928	28,157	90,808	94,253	83,028
Goodwill and other asset impairment	4,282		225,035				5,375		229,317	5,375
Restructuring charges	6,754		17,678		1,812		2,337	(87)	24,432	4,062	25,444
Acquisition related costs			2,523		2,409				2,523	2,409
Interest expense	625	636	494	270	83	158	206	224	2,025	671	2,511
Total expenses	136,281	132,229	377,208	132,947	135,198	119,020	135,954	131,249	778,665	521,421	556,618
(Loss) income before income tax expense	(6,358)	17,190	(234,591)	17,131	3,148	11,376	19,368	15,441	(206,628)	49,333	76,451
Income tax (benefit) expense	(2,686)	6,713	(38,448)	7,582	1,318	5,166	11,860	7,009	(26,839)	25,353	33,617
Net (loss) income	$ (3,672)	$ 10,477	$ (196,143)	$ 9,549	$ 1,830	$ 6,210	$ 7,508	$ 8,432	$ (179,789)	$ 23,980	$ 42,834
Basic (loss) earnings per share (in dollars per share)	$ (0.09)	$ 0.26	$ (4.77)	$ 0.23	$ 0.04	$ 0.15	$ 0.17	$ 0.19	$ (4.42)	$ 0.56	$ 0.98
Diluted (loss) earnings per share (in dollars per share)	$ (0.09)	$ 0.25	$ (4.77)	$ 0.23	$ 0.04	$ 0.14	$ 0.17	$ 0.19	$ (4.42)	$ 0.55	$ 0.97
Basic weighted average number of common shares outstanding (in shares)	39,624	40,615	41,112	41,435	41,636	42,407	43,226	43,827	40,691	42,767	43,538
Diluted weighted average number of common shares outstanding (in shares)	39,624	41,271	41,112	42,180	42,538	42,941	43,704	44,415	40,691	43,496	44,018