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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Valuation Allowance [Line Items]          
Provision for (benefit from) income taxes $ 6,107 $ 5,805 $ 10,624 $ 11,244  
Payment of withholding taxes to foreign tax authorities 5,400 $ 4,800 10,900 $ 9,600  
Deferred Tax Assets, Gross 165,400   165,400    
Deferred Tax Assets, Valuation Allowance 21,300   21,300    
Unrecognized tax benefits 22,400   22,400   $ 20,800
Unrecognized tax benefits, reduction of long-term deferred tax assets 19,600   19,600   18,600
Unrecognized tax benefits included in long-term income taxes payable 2,800   2,800   $ 2,200
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,800   $ 2,800