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Fair-Value Measurements (Fair Value of Financial Assets Liabilities Measured on Recurring Basis) (Details) - Fair Value, Recurring - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Level 1 | Commodity Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 359 | $ 1,754
Liabilities | (2,589) | (5,459)
Level 1 | Embedded Derivative Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 0 | 0
Level 2 | Commodity Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1,867 | 616
Liabilities | (608) | 0
Level 2 | Embedded Derivative Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 0 | 0
Level 3 | Commodity Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Level 3 | Embedded Derivative Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | $ (83,210) | $ (52,372)

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