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Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Accrued Liabilities and Other [Abstract] |  |
Accrued accounts payable invoices | $ 12,447 | $ 4,070
Gabon DMO, PID and PIH obligations | 8,531 | 3,960
Derivative liability - crude oil swaps | 10,881 |
Capital expenditures | 2,475 | 435
Stock appreciation rights - current portion | 761 | 2,289
Accrued wages and other compensation | 2,411 | 2,108
Other | 2,351 | 4,322
Total accrued liabilities and other | $ 39,857 | $ 17,184

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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