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Organization and Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SARs liability | $ 761 | $ 2,289
Derivative liability - crude oil swaps | 10,881 |
SARs liability |  | 193
Liabilities | 11,642 | 2,482
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SARs liability | 761 | 2,289
Derivative liability - crude oil swaps | 10,881 |
SARs liability |  | 193
Liabilities | $ 11,642 | $ 2,482

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