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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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