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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Valuation Allowance [Line Items]      
Provision for (benefit from) income taxes $ 4,517 $ 5,439  
Payment of withholding taxes to foreign tax authorities 5,500 $ 4,800  
Deferred Tax Assets, Gross 166,700    
Deferred Tax Assets, Valuation Allowance 21,900    
Unrecognized tax benefits 22,100   $ 20,800
Unrecognized tax benefits, reduction of long-term deferred tax assets 19,600   18,600
Unrecognized tax benefits included in long-term income taxes payable 2,500   $ 2,200
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,500