Derivative Financial Instruments (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commodity futures, asset derivatives	$ 2,483	$ 4,271
Commodity futures, liability derivatives	9,305	7,388
Designated as hedging instrument | Commodity contract | Futures | Other current assets
Commodity futures, asset derivatives	1,065	2,169
Commodity futures, liability derivatives	1,097	2,119
Not designated as hedging instrument | Commodity contract | Futures | Other current assets
Commodity futures, asset derivatives	1,418	2,102
Commodity futures, liability derivatives	$ 8,208	$ 5,269