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Income Taxes - Foreign Taxes Incurred (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) $ 23,141 $ (2,957) $ 13,893
Latin America      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 8,636 1,261 5,469
West Africa      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 4,688 2,692 3,243
Middle East      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 5,579 2,249 1,633
Europe      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 1,096 461 1,348
Asia Pacific      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) 1,525 922 1,388
Other      
Foreign Taxes Incurred By Regions [Line Items]      
Total foreign income tax expense (benefit) $ 1,617 $ (10,542) $ 812