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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income $ 35,846 $ 28,287 $ 156,870 $ 128,774
Other comprehensive income (loss), net of tax:        
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $8, $6, $14 and $15, respectively) (14) (18) (32) (34)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(68), $(157), $(113) and $(374), respectively) 119 440 262 821
Other comprehensive income (loss), net of tax (2,738) 1,882 (2,732) 2,900
Comprehensive income 33,108 30,169 154,138 131,674
Net income attributable to non-controlling interest (2,431) (3,126) (5,929) (7,297)
Comprehensive income available for common stock 30,677 27,043 148,209 124,377
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 475 563 1,011 1,086
Commodity Contract        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax (1,004) (42) (2,706) (19)
Net unrealized gains (losses) on commodity derivatives (net of tax of $734, $(304), $394 and $(339), respectively) $ (2,314) $ 939 $ (1,267) $ 1,046