Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,407	$ 9,662	$ 61,884	$ 63,646
Reclassifications of amortization of prior service credit and actuarial loss, net of tax of $3, $6, $10 and $19, respectively	11	18	32	53
Other comprehensive income (loss)	1,922	(2,768)	242	(2,701)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	11,329	6,894	62,126	60,945
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(26)	(2,241)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			26	2,241
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			268	(460)
Reclassifications of amortization of prior service credit and actuarial loss, net of tax of $3, $6, $10 and $19, respectively	11	18	32	53
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Statement of Comprehensive Income [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(118)	0	(260)	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	118	0	260	0
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Statement of Comprehensive Income [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	328	(74)	202	(2,294)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(328)	74	(202)	2,294
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,385	(2,865)	(660)	(613)
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]
Statement of Comprehensive Income [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(260)	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			260	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ 316	$ 153	$ 928	$ 153