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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income $ 37,834 $ 48,162 $ 194,704 $ 176,936
Other comprehensive income (loss), net of tax:        
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $8, $6, $22 and $21, respectively) (16) (19) (48) (53)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(66), $(139), $(179) and $(513), respectively) 122 459 384 1,280
Other comprehensive income (loss), net of tax 2,427 5,277 (305) 8,177
Comprehensive income 40,261 53,439 194,399 185,113
Less: comprehensive income attributable to non-controlling interest (2,861) (4,050) (8,790) (11,347)
Comprehensive income available for common stock 37,400 49,389 185,609 173,766
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 578 657 1,589 1,743
Commodity Contract        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax (33) (250) (2,739) (269)
Net unrealized gains on commodity derivatives (net of tax of $(559), $(1,437), $(165) and $(1,776), respectively) $ 1,776 $ 4,430 $ 509 $ 5,476