Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,662	$ 12,475	$ 63,646	$ 60,754
Amortization of prior service cost, net of tax of $(5), $(5), $(15) and $(15), respectively	(14)	(14)	(42)	(42)
Net gain, net of tax of $28, $28, $53 and $55, respectively	(32)	(78)	(95)	(234)
Unrealized gain (loss) on commodity contract cash flow hedges, net of tax of $(1,111), $688, $(1,115) and $1,945, respectively	(2,939)	1,803	(2,907)	5,094
Unrealized gain/(loss) on interest rate swap cash flow hedges, net of tax of $2, $(14), $1 and $(14), respectively	153	14	153	18
Other comprehensive income (loss)	(2,768)	1,881	(2,701)	5,304
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 6,894	$ 14,356	$ 60,945	$ 66,058