Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 87,212	$ 89,796	$ 83,466
Employee Benefits, net of tax:
Reclassifications of amortization of prior service credit and actuarial loss, net of tax of $11, $18 and $550, respectively	32	57	1,616
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	110	(705)	(262)
Cash Flow Hedges, net of tax:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent		0	0
Total Other Comprehensive (Loss) Income	(1,359)	(2,682)	4,168
Comprehensive Income	85,853	87,114	87,634
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(400)	(2,453)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	400	2,453
Reclassifications of amortization of prior service credit and actuarial loss, net of tax of $11, $18 and $550, respectively	32	57	1,616
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	110	(705)	(262)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(959)	(229)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent		0	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Cash Flow Hedges, net of tax:
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(388)	35	28
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	388	(35)	(28)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Cash Flow Hedges, net of tax:
Net (loss) gain on commodity contract cash flow hedges, net of tax of $(501), $(369) and $2,702, respectively		(934)	7,075
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(44)	(2,545)	(4,813)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	44	2,545	4,813
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(1,322)	(934)
Net (loss) gain on commodity contract cash flow hedges, net of tax of $(501), $(369) and $2,702, respectively		(934)	$ 7,075
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges
Cash Flow Hedges, net of tax:
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(388)	35
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	388	(35)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	$ 473	$ 0