Derivative Financial Instruments (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Commodity futures, asset derivatives	$ 36,698	$ 5,597
Commodity futures, liability derivatives	23,262	13,601
Designated as hedging instrument \| Commodity contract \| Futures \| Other current assets
Commodity futures, asset derivatives	14,717	1,278
Commodity futures, liability derivatives	11,403	7,430
Not designated as hedging instrument \| Commodity contract \| Futures \| Other current assets
Commodity futures, asset derivatives	21,981	4,319
Commodity futures, liability derivatives	$ 11,859	$ 6,171

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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