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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Jan. 01, 2018
Valuation Allowance [Line Items]          
Deferred Tax Assets, Gross $ 140,500       $ 105,000
Deferred Tax Assets, Valuation Allowance 66,600       $ 16,000
Deferred Tax Assets, Net 73,900        
Provision for (benefit from) income taxes (3,229)   $ 7,376    
Unrecognized tax benefits 24,000 $ 22,600   $ 22,600  
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit 2,400        
Unrecognized tax benefits included in long-term income taxes payable 2,400 2,200   2,200  
Unrecognized tax benefits, reduction of long-term deferred tax assets 21,600 20,400   $ 20,400  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 15,600 $ 21,500      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%     35.00%  
Foreign Tax Credit [Member]          
Valuation Allowance [Line Items]          
Deferred Tax Assets, Valuation Allowance $ 37,100        
Foreign Tax Authority [Member]          
Valuation Allowance [Line Items]          
Income Taxes Paid $ 6,100   $ 5,500