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Derivatives (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Liability Derivatives:    
Preferred Distribution Rate Reset Election $ (51,500)  
Embedded Derivative Financial Instruments | Other Long-Term Liabilities    
Liability Derivatives:    
Preferred Distribution Rate Reset Election (51,515) $ (40,840)
Not Designated As Hedging Instrument | Commodity Derivatives | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 207 3,431
Gross amount offset in the Consolidated Balance Sheets (207) (1,361)
Net amount of assets presented in the Consolidated Balance Sheets 0 2,070
Liability Derivatives:    
Gross amount of recognized liabilities (2,079) (1,361)
Gross amount offset in the Consolidated Balance Sheets 1,064 1,361
Net amount of liabilities presented in the Consolidated Balance Sheets (1,015) 0
Not Designated As Hedging Instrument | Swap | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 1,382 1,274
Not Designated As Hedging Instrument | Swap | Current Liabilities - Accrued Liabilities    
Liability Derivatives:    
Gross amount of recognized liabilities 0 (125)
Designated as Hedging Instrument | Commodity Derivatives | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 4 469
Gross amount offset in the Consolidated Balance Sheets (4) (44)
Net amount of assets presented in the Consolidated Balance Sheets 0 425
Liability Derivatives:    
Gross amount of recognized liabilities (50) (44)
Gross amount offset in the Consolidated Balance Sheets 50 44
Net amount of liabilities presented in the Consolidated Balance Sheets $ 0 $ 0