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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
(Tax) benefit on reclassification adjustment of benefit plan liability - prior service cost	$ 6	$ 9
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	(45)	(217)
Interest rate swaps
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives	(177)	(190)
Commodity Contract
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives	552	(8)
(Tax) benefit on net unrealized gains (losses) on commodity derivatives	$ (340)	$ (35)

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- Definition

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

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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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