Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal									$ 416	$ (1,160)	$ 18,524
State									782	1,282	5,026
Foreign									3,362	5,632	6,118
Total									4,560	5,754	29,668
Deferred:
Federal									(19,423)	(25,146)	(4,289)
State									(7,565)	(8,409)	(766)
Foreign									(168)	962	740
Total									(27,156)	(32,593)	(4,315)
Total, income tax expense	(2,117)	(51)	(23,464)	3,036	(2,686)	6,713	(38,448)	7,582	(22,596)	(26,839)	25,353
Components of income before income taxes
U.S.									(248,101)	(222,337)	45,000
Foreign									(22,354)	15,709	4,333
(Loss) income before income tax (benefit) expense	(8,570)	181	(270,560)	8,494	(6,358)	17,190	(234,591)	17,131	(270,455)	(206,628)	49,333
Deferred tax assets:
Compensation and benefits	9,474				9,565				9,474	9,565
Net operating loss and capital loss carry forward	19,012				15,810				19,012	15,810
Share-based compensation	8,506				12,430				8,506	12,430
Allowance for doubtful accounts	1,149				663				1,149	663
Tax benefits on uncertain tax positions	2,696				2,846				2,696	2,846
Goodwill and other intangibles	24,746				2,370				24,746	2,370
Depreciation	649								649
Other	9,203				8,914				9,203	8,914
Total deferred tax assets	75,435				52,598				75,435	52,598
Less: valuation allowance	20,774				16,279				20,774	16,279
Total deferred tax assets, net of valuation allowance	54,661				36,319				54,661	36,319
Deferred tax liabilities:
Depreciation					(2,038)					(2,038)
Capitalized software	(15,226)				(17,769)				(15,226)	(17,769)
Other	(573)				(738)				(573)	(738)
Total deferred tax liabilities	(15,799)				(20,545)				(15,799)	(20,545)
Net deferred tax assets (liabilities)	$ 38,862				$ 15,774				$ 38,862	$ 15,774