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Summary of Significant Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity | $ 636 | $ 3,520
Assets | 636 | 3,520
SARs liability | 2,638 | 1,007
SARs liability | 852 | 625
Liabilities | 3,490 | 1,632
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity | 636 | 3,520
Assets | 636 | 3,520
SARs liability | 2,638 | 1,007
SARs liability | 852 | 625
Liabilities | $ 3,490 | $ 1,632

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