Quarterly report pursuant to Section 13 or 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
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities and Other [Abstract]    
Accrued accounts payable invoices $ 4,915 $ 4,669
Joint venture audit settlement 4,399  
Gabon domestic market social investment obligations 2,767 3,145
Capital expenditures 6,158 2,038
Stock appreciation rights 2,516 1,007
Accrued wages and other compensation 1,468 1,802
Other 1,663 1,477
Total accrued liabilities and other $ 23,886 $ 14,138