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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Contingency [Line Items]        
Effective tax rate on pre-tax losses     (15.80%) (6.90%)
Pre tax losses $ (28,405) $ (41,608) $ (23,440) $ (72,106)
Base Erosion And Anti-Abuse Tax [Member]        
Income Tax Contingency [Line Items]        
Increase in income tax expense     $ 1,700