Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]
Reserves and allowances	$ 18,840	$ 8,833
Payroll and related accruals	5,343	5,953
State net operating loss carryforwards	6,216	0
Other	409	446
Less: valuation allowance	(777)	(511)
Total current deferred tax assets	30,031	14,721
Equity compensation	17,376	16,940
Deferred rent	2,241	2,935
Net operating loss carryforwards, federal	12,141	0
Deferred Tax Assets, Capital Loss Carryforwards	232	0
Federal tax credit carryforwards	4,408	4,809
Other	5,920	3,669
Less: valuation allowance	(2,864)	(2,367)
Total noncurrent deferred tax assets	39,454	25,986
Total deferred tax assets	69,485	40,707
Prepaid assets and other	(1,873)	(2,458)
Deferred Tax Liabilities, Other, Current	(5)	0
Deferred Tax Liabilities, Gross, Current	(1,878)	(2,458)
Fixed assets	(2,684)	(1,409)
Intangible assets	(40,544)	(51,546)
Developed software	(3,568)	(4,559)
Financing fees	(1,940)	(10,637)
Deferred Tax Liabilities, Other, Non Current	(543)	0
Total non-current deferred tax liabilities	(49,279)	(68,151)
Total deferred tax liabilities	(51,157)	(70,609)
Net deferred tax liabilities	$ 18,328	$ (29,902)