Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Reserves and allowances	$ 8,833	$ 28,998
Payroll and related accruals	5,953	1,374
Other	446	514
Less: valuation allowance	(511)	(1,359)
Total current deferred tax assets	14,721	29,527
Equity compensation	16,940	15,424
Financing fees	0	3,668
Deferred rent	2,935	3,284
State net operating loss carryforwards	4,809	6,413
Other	3,669	3,149
Less: valuation allowance	(2,367)	(3,308)
Total noncurrent deferred tax assets	25,986	28,630
Total deferred tax assets	40,707	58,157
Prepaid assets and other	(2,458)	(3,076)
Fixed assets	(1,409)	(3,952)
Intangible assets	(51,546)	(52,286)
Developed software	(4,559)	(4,890)
Financing fees	(10,637)	0
Total non-current deferred tax liabilities	(68,151)	(61,128)
Total deferred tax liabilities	(70,609)	(64,204)
Net deferred tax liabilities	$ (29,902)	$ (6,047)