Derivative Financial Instruments (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commodity futures, asset derivatives	$ 20,888	$ 5,597
Commodity futures, liability derivatives	13,218	13,601
Designated as hedging instrument \| Commodity contract \| Futures \| Other current assets
Commodity futures, asset derivatives	13,920	1,278
Commodity futures, liability derivatives	3,802	7,430
Not designated as hedging instrument \| Commodity contract \| Futures \| Other current assets
Commodity futures, asset derivatives	6,968	4,319
Commodity futures, liability derivatives	$ 9,416	$ 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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