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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]            
Deferred Tax Assets, Gross $ 142,700   $ 142,700   $ 105,000  
Deferred Tax Assets, Valuation Allowance 66,900   66,900   $ 16,000  
Deferred Tax Assets, Net 76,000   76,000      
Provision for (benefit from) income taxes (1,015) $ 2,507 (4,244) $ 9,883    
Unrecognized tax benefits 23,800   23,800     $ 22,600
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 21,600   21,600     $ 20,400
Foreign Tax Authority [Member]            
Valuation Allowance [Line Items]            
Income Taxes Paid $ 5,000 $ 5,400 $ 11,100 $ 10,900