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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
Jun. 30, 2022
Dec. 31, 2021
Level 1 | Commodity Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value $ 5,815 $ 359
Liabilities Fair Value (1,226) (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 135 1,867
Liabilities Fair Value (810) (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 $ (76,817) $ (83,210)