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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Contingency [Line Items]        
Effective tax rate on pre-tax losses     (7.10%) 15.70%
Income tax expense (benefit) $ 845 $ (20,418) $ 4,541 $ (15,465)
Pre tax losses $ (40,273) (26,553) (63,713) $ (98,659)
Recognized tax benefits resulting from lapse of applicable statute of limitations   $ 22,700    
Base Erosion And Anti-Abuse Tax [Member]        
Income Tax Contingency [Line Items]        
Increase in income tax expense     $ 2,800