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Derivative Financial Instruments - Commodity Contracts, etc. (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair values of derivative financial instruments    
Asset Derivatives $ 140,988 $ 119,757
Liability Derivatives (90,926) (113,848)
Exchange-Traded Derivatives | Broker margin deposits    
Fair values of derivative financial instruments    
Asset Derivatives 119,230 108,105
Liability Derivatives (66,501) (82,194)
Forward derivative contracts | Derivative assets    
Fair values of derivative financial instruments    
Asset Derivatives 21,758 11,652
Forward derivative contracts | Derivative liabilities    
Fair values of derivative financial instruments    
Liability Derivatives (24,425) (31,654)
Derivatives designated as hedging instruments    
Fair values of derivative financial instruments    
Asset Derivatives 4,149 1,476
Liability Derivatives   (9,201)
Derivatives designated as hedging instruments | Exchange-Traded Derivatives | Broker margin deposits    
Fair values of derivative financial instruments    
Asset Derivatives 4,149 1,476
Liability Derivatives   (9,201)
Derivatives not designated as hedging instruments    
Fair values of derivative financial instruments    
Asset Derivatives 136,839 118,281
Liability Derivatives (90,926) (104,647)
Derivatives not designated as hedging instruments | Exchange-Traded Derivatives | Broker margin deposits    
Fair values of derivative financial instruments    
Asset Derivatives 115,081 106,629
Liability Derivatives (66,501) (72,993)
Derivatives not designated as hedging instruments | Forward derivative contracts | Derivative assets    
Fair values of derivative financial instruments    
Asset Derivatives 21,758 11,652
Derivatives not designated as hedging instruments | Forward derivative contracts | Derivative liabilities    
Fair values of derivative financial instruments    
Liability Derivatives $ (24,425) $ (31,654)