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Income Taxes - Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards [Line Items]    
Loss carryforwards $ 1,048,000  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards subject to expiration 150,600  
Operating loss carryforwards not subject to expiration 897,500  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards [Line Items]    
Loss carryforwards $ 62,900 $ 59,800