Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities and Other [Abstract]
Accrued accounts payable invoices	$ 4,683	$ 4,650
Joint venture audit settlement		3,322
Gabon DMO, PID and PIH obligations	4,193	3,314
Capital expenditures	2,894	11,792
Stock appreciation rights	1,380	2,638
Accrued wages and other compensation	1,318	1,731
Other	1,831	2,326
Total accrued liabilities and other	$ 16,299	$ 29,773

Accrued Liabilities, Current, Accounts Payable Invoices

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- Definition

Capital Expenditures Incurred But Not Yet Paid, Current Liabilities

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- Definition

Joint Venture Audit Settlement

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- Definition

Social Investment Obligations

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- Definition

Amount of liabilities incurred to vendors for goods and services received, and accrued liabilities classified as other, payable within one year or the normal operating cycle, if longer.

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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).

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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=6877327&loc=d3e13212-122682

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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