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Summary of Significant Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity |  | $ 636
Assets |  | 636
SARs liability | $ 2,289 | 2,638
SARs liability | 193 | 852
Liabilities | 2,482 | 3,490
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity |  | 636
Assets |  | 636
SARs liability | 2,289 | 2,638
SARs liability | 193 | 852
Liabilities | $ 2,482 | $ 3,490

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