Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.19.1
Income Taxes (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
Income Taxes [Line Items]  
Effective income tax rate 77.00%
Authorities Other Than United States And Gabon [Member]  
Income Taxes [Line Items]  
Effective income tax rate 0.00%