Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details)

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Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities and Other [Abstract]    
Accrued accounts payable invoices $ 4,650 $ 4,669
Joint venture audit settlement 3,322  
Gabon DMO, PID and PIH obligations 3,314 3,145
Capital expenditures 11,792 2,038
Stock appreciation rights 2,638 1,007
Accrued wages and other compensation 1,731 1,802
Other 2,326 1,477
Total accrued liabilities and other $ 29,773 $ 14,138