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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Valuation Allowance [Line Items]          
Deferred Tax Assets, Gross $ 176,600   $ 176,600    
Deferred Tax Assets, Valuation Allowance 190,900   190,900    
Deferred Tax Liabilities, Net 14,300   14,300    
Provision for (benefit from) income taxes 4,372 $ (1,015) 4,681 $ (4,244)  
Unrecognized tax benefits 24,300   24,300   $ 23,500
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,100   2,100    
Foreign Tax Authority [Member]          
Valuation Allowance [Line Items]          
Income Taxes Paid 4,500 $ 5,000 8,800 $ 11,100  
Long Term Deferred Tax Assets [Member]          
Valuation Allowance [Line Items]          
Unrecognized tax benefits 22,200   22,200   21,400
Long Term Income Taxes Payable [Member]          
Valuation Allowance [Line Items]          
Unrecognized tax benefits $ 2,100   $ 2,100   $ 2,100