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Income Taxes - Foreign Taxes Incurred (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) $ (2,957) $ 13,893 $ 14,717
Latin America      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 1,261 5,469 1,159
West Africa      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 2,692 3,243 3,687
Middle East      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 2,249 1,633 1,880
Europe      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 461 1,348 5,132
Asia Pacific      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 922 1,388 1,364
Other      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) $ (10,542) $ 812 $ 1,495