Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal									$ 2,628	$ 416	$ (1,160)
State									1,634	782	1,282
Foreign									4,657	3,362	5,632
Total									8,919	4,560	5,754
Deferred:
Federal									1,606	(19,423)	(25,146)
State									992	(7,565)	(8,409)
Foreign									453	(168)	962
Total									3,051	(27,156)	(32,593)
Total, income tax expense (benefit)	981	2,975	5,684	2,330	(2,117)	(51)	(23,464)	3,036	11,970	(22,596)	(26,839)
Components of income (loss) before income taxes
U.S.									15,687	(248,101)	(222,337)
Foreign									27,368	(22,354)	15,709
Income (loss) before income tax expense (benefit)	10,643	10,690	10,770	10,952	(8,570)	181	(270,560)	8,494	43,055	(270,455)	(206,628)
Deferred tax assets:
Compensation and benefits	12,844				9,474				12,844	9,474
Net operating loss and capital loss carryover	17,121				19,012				17,121	19,012
Share-based compensation	6,959				8,506				6,959	8,506
Allowance for doubtful accounts	889				1,149				889	1,149
Tax benefits on uncertain tax positions	2,697				2,696				2,697	2,696
Goodwill and other intangibles	21,138				24,746				21,138	24,746
Depreciation					649					649
Other	9,757				9,203				9,757	9,203
Total deferred tax assets	71,405				75,435				71,405	75,435
Less: valuation allowance	20,541				20,774				20,541	20,774
Total deferred tax assets, net of valuation allowance	34,130				39,155				34,130	39,155
Deferred tax liabilities:
Depreciation	(3,916)								(3,916)
Capitalized software	(12,838)				(15,226)				(12,838)	(15,226)
Other	(343)				(573)				(343)	(573)
Total deferred tax liabilities	(17,097)				(15,799)				(17,097)	(15,799)
Net deferred tax assets	$ 33,767				$ 38,862				$ 33,767	$ 38,862