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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Embedded Derivative, Fair Value, Liability $ (40,800)  
Preferred Distribution Rate Reset Election | Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Embedded Derivative, Fair Value, Liability (40,809) $ (51,515)
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 921 207
Derivative Asset, Fair Value, Gross Liability (921) (207)
Asset Derivatives 0 0
Derivative Liability, Fair Value, Gross Liability (3,155) (2,079)
Derivative Liability, Fair Value, Gross Asset 3,155 1,064
Liability Derivatives 0 (1,015)
Not qualifying or not designated as hedges under accounting rules | Swap | Current Assets - Other    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 937 1,382
Not qualifying or not designated as hedges under accounting rules | Swap | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (67) 0
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 283 4
Derivative Asset, Fair Value, Gross Liability (283) (4)
Asset Derivatives 0 0
Derivative Liability, Fair Value, Gross Liability (3,282) (50)
Derivative Liability, Fair Value, Gross Asset 3,282 50
Liability Derivatives $ 0 $ 0