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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, 2020
Dec. 31, 2019
Level 1 | Commodity Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value $ 1,204 $ 211
Liabilities Fair Value (6,437) (2,129)
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 | Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value 937 1,382
Liabilities Fair Value (67) 0
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 $ (40,809) $ (51,515)