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Derivatives (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Liability Derivatives:    
Preferred Distribution Rate Reset Election $ (83,200)  
Embedded Derivative Financial Instruments | Other Noncurrent Liabilities    
Liability Derivatives:    
Preferred Distribution Rate Reset Election (83,210) $ (52,372)
Not Designated As Hedging Instrument | Commodity Derivatives | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 310 732
Gross amount offset in the Consolidated Balance Sheets (310) (732)
Net amount of assets presented in the Consolidated Balance Sheets 0 0
Liability Derivatives:    
Gross amount of recognized liabilities (2,380) (2,114)
Gross amount offset in the Consolidated Balance Sheets 2,380 2,114
Net amount of liabilities presented in the Consolidated Balance Sheets 0 0
Not Designated As Hedging Instrument | Swap | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 1,867 616
Not Designated As Hedging Instrument | Swap | Current Liabilities - Accrued Liabilities    
Liability Derivatives:    
Gross amount of recognized liabilities (608) 0
Designated as Hedging Instrument | Commodity Derivatives | Current Assets - Other    
Asset Derivatives:    
Gross amount of recognized assets 49 1,022
Gross amount offset in the Consolidated Balance Sheets (49) (1,022)
Net amount of assets presented in the Consolidated Balance Sheets 0 0
Liability Derivatives:    
Gross amount of recognized liabilities (209) (3,345)
Gross amount offset in the Consolidated Balance Sheets 209 3,073
Net amount of liabilities presented in the Consolidated Balance Sheets $ 0 $ (272)