Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Other Comprehensive Income [Abstract]
Amortization of prior service cost, tax	$ 3	$ 6	$ 10	$ 19
Net gain, tax	0	0	0	0
Unrealized (loss)/gain on commodity contract cash flow hedges, tax	525	(1,083)	(250)	(246)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps During Period, Tax	112	54	325	54
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service cost, tax	3	6	10	19
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	0	0	0	0
Unrealized (loss)/gain on commodity contract cash flow hedges, tax	525	(1,083)	(250)	(246)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps During Period, Tax	112	54	325	54
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	124	(28)	76	(869)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	124	(28)	76	(869)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(42)	0	(92)	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ (42)	$ 0	$ (92)	$ 0