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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
(Tax) benefit on benefit plan liability adjustments - net gain (loss)	$ 0	$ 0	$ 0	$ (17)
(Tax) benefit on benefit plan liability adjustments - prior service costs	6	6	21	19
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	(139)	(149)	(513)	(426)
Interest rate swaps
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives	(55)	(168)	(395)	(508)
Commodity Contract
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives	81	(41)	87	(172)
(Tax) benefit on net unrealized gains (losses) on commodity derivatives	$ (1,437)	$ (112)	$ (1,776)	$ (44)

X

- Definition

Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) for adjustments from accumulated other comprehensive income (AOCI) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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- Definition

Amount of tax (expense) benefit for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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