Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Income	$ 10,956	$ 8,304	$ 39,886	$ 36,968
Other Comprehensive Income (Loss), net of tax:
Amortization of prior service cost, net of tax of $(5), $(5), $(10) and $(10), respectively	(14)	(14)	(28)	(29)
Net gain, net of tax of $28, $42, $55 and $86, respectively	80	121	160	242
Cash Flow Hedges, net of tax:
Unrealized gain (loss) on commodity contract cash flow hedges, net of tax of $651, $(850), $653 and $343, respectively	1,703	(2,115)	1,710	868
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	(37)		(37)
Total Other Comprehensive Income (Loss), net of tax	1,732	(2,008)	1,805	1,081
Comprehensive Income	$ 12,688	$ 6,296	$ 41,691	$ 38,049