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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net income $ 121,024 $ 100,487
Other comprehensive income (loss), net of tax:    
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $6 and $9, respectively) (18) (16)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(45) and $(217), respectively) 143 381
Other comprehensive income, net of tax 6 1,018
Comprehensive income 121,030 101,505
Net income attributable to non-controlling interest (3,498) (4,171)
Comprehensive income available for common stock 117,532 97,334
Interest rate swaps    
Other comprehensive income (loss), net of tax:    
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 536 523
Commodity Contract    
Other comprehensive income (loss), net of tax:    
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax (1,702) 23
Net unrealized gains (losses) on commodity derivatives (net of tax of $(340) and $(35), respectively) $ 1,047 $ 107