Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Gains or losses on derivative instruments, statement of income
Ineffectiveness - amount of gain recognized in income on related hedged items	$ 172,000	$ (151,000)	$ 219,000	$ 145,000
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Goods Sold.	Cost of Goods Sold.	Cost of Goods Sold.	Cost of Goods Sold.
Gain (Loss) excluded from hedge effectiveness testing	$ (1,500,000)	$ 817,000	$ 732,000	$ 1,900,000
Amount of gain (loss) related to cash flow hedges	(2,300,000)	10,000,000.0	(38,000)	6,800,000
Net gains (losses) reclassified	(341,000)	$ (7,100,000)	1,800,000	$ (7,700,000)
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	(651,000)		$ (651,000)
Period Within Which The Company Expects To Reclassify Net Gains On Derivative Instruments From AOCI to Earnings			12 months
Futures | Commodity contract
Commodity contract commitments
Fair value of derivatives including required margin deposits	$ 20,900,000		$ 20,900,000		$ 23,500,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current		Other Assets, Current		Other Assets, Current