Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Other Comprehensive Income [Abstract]
Amortization of prior service cost, tax	$ 3	$ 6	$ 5	$ 13
Net gain, tax	0	0	0	0
Unrealized (loss)/gain on commodity contract cash flow hedges, tax	(784)	(110)	(775)	826
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps During Period, Tax	267	0	213	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service cost, tax	3	6	5	13
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	(784)	(110)	(775)	826
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps During Period, Tax	267	0	213	0
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	119	(78)	(48)	(830)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	119	(78)	(48)	(830)
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	(33)	0	(50)	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ (33)	$ 0	$ (50)	$ 0