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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Contingency [Line Items]    
Effective tax rate on pre-tax losses 47.30% (7.00%)
Pre tax losses $ 4,965 $ (30,498)
Base Erosion And Anti-Abuse Tax [Member]    
Income Tax Contingency [Line Items]    
Increase in income tax expense $ 1,400