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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income $ 100,487 $ 97,224
Other comprehensive income (loss), net of tax:    
Benefit plan liability adjustments - net gain (net of tax of $0 and $(17), respectively) 0 55
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $9 and $7, respectively) (16) (23)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(217) and $(95), respectively) 381 502
Other comprehensive income, net of tax 1,018 1,273
Comprehensive income 101,505 98,497
Net income attributable to noncontrolling interest (4,171) (4,050)
Comprehensive income available for common stock 97,334 94,447
Interest rate swaps    
Other comprehensive income (loss), net of tax:    
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 523 543
Commodity Contract    
Other comprehensive income (loss), net of tax:    
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 23 371
Net unrealized gains (losses) on commodity derivatives (net of tax of $(35) and $54, respectively) $ 107 $ (175)