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Fair-Value Measurements (Placement of Assets and Liabilities Within the Fair Value Hierarchy Levels) (Details) - Recurring Fair Value Measures - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Level 1 | Commodity Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Fair Value | $ 7,544 | $ 359
Liabilities Fair Value | (1,341) | (2,589)
Level 1 | Preferred Distribution Rate Reset Election |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities Fair Value | 0 | 0
Level 2 | Swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Fair Value | 300 | 1,867
Liabilities Fair Value | (946) | (608)
Level 2 | Preferred Distribution Rate Reset Election |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities Fair Value | 0 | 0
Level 3 | Commodity Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Fair Value | 0 | 0
Liabilities Fair Value | 0 | 0
Level 3 | Preferred Distribution Rate Reset Election |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities Fair Value | $ (87,468) | $ (83,210)

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