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Fair Value of Financial Instruments - Derivative Contract Positions (Details)
bbl in Thousands, $ in Thousands
Mar. 31, 2022
USD ($)
bbl
Mar. 31, 2021
USD ($)
bbl
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ 50,364 $ 7,501
Net cash collateral provided (held) 839 8,203
Net commodity derivative (liability) asset 51,203 15,704
Fixed-price contract | Crude oil    
Derivative contract information    
Fair Value of Net Assets (Liabilities) 35,662 (5,414)
Fixed-price contract | Propane    
Derivative contract information    
Fair Value of Net Assets (Liabilities) 3,785 2,188
Fixed-price contract | Refined products    
Derivative contract information    
Fair Value of Net Assets (Liabilities) (6,063) 1,928
Fixed-price contract | Butane    
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ (1,711) $ (3,764)
Fixed-price contract | Short | Crude oil    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl (1,330) (1,850)
Fixed-price contract | Short | Propane    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl   (195)
Fixed-price contract | Short | Refined products    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl   (503)
Fixed-price contract | Short | Butane    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl (268) (753)
Fixed-price contract | Long | Propane    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl 184  
Fixed-price contract | Long | Refined products    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl 685  
Other    
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ 18,691 $ 12,563