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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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 15 13
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss (157) (182) (374) (277)
Interest rate swaps        
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives (150) (170) (340) (340)
Commodity Contract        
(Tax) benefit on reclassification of net realized (gains) losses on settled/amortized derivatives 14 (16) 6 (131)
(Tax) benefit on net unrealized gains (losses) on commodity derivatives $ (304) $ 14 $ (339) $ 68