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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Valuation Allowance [Line Items]          
Deferred Tax Assets, Gross $ 219,500   $ 219,500    
Deferred Tax Assets, Valuation Allowance 26,200   26,200    
Provision for (benefit from) income taxes 2,507 $ 6,107 9,883 $ 10,624  
Unrecognized tax benefits 22,900   22,900   $ 21,900
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,200   2,200    
Unrecognized tax benefits included in long-term income taxes payable 2,200   2,200   2,200
Unrecognized tax benefits, reduction of long-term deferred tax assets 20,700   20,700   $ 19,700
Foreign Tax Authority [Member]          
Valuation Allowance [Line Items]          
Income Taxes Paid $ 5,400 $ 5,400 $ 10,900 $ 10,900