Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 17,051	$ 13,813	$ 53,985	$ 48,279
Amortization of prior service cost, net of tax of $(5), $(5), $(10) and $(10), respectively	(14)	(14)	(28)	(28)
Net gain, net of tax of $28, $28, $53 and $55, respectively	(32)	(78)	(63)	(156)
Unrealized gain (loss) on commodity contract cash flow hedges, net of tax of $(188), $1,193, $(4) and $1,257, respectively	(498)	3,126	32	3,291
Unrealized gain/(loss) on interest rate swap cash flow hedges, net of tax of $2, $(14), $1 and $(14), respectively	0	6	0	4
Other comprehensive income (loss)	(480)	3,196	67	3,423
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 16,571	$ 17,009	$ 54,052	$ 51,702