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Summary of Significant Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SARs liability | $ 609 | $ 2,289
Derivative liability - crude oil swaps | 4,806 |
SARs liability |  | 193
Liabilities | 5,415 | 2,482
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SARs liability | 609 | 2,289
Derivative liability - crude oil swaps | 4,806 |
SARs liability |  | 193
Liabilities | $ 5,415 | $ 2,482

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