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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income $ 48,162 $ 40,349 $ 176,936 $ 162,267
Other comprehensive income (loss), net of tax:        
Benefit plan liability adjustments - net gain (net of tax of $0, $0, $0 and $(17), respectively) 0 0 0 55
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $6, $6, $21 and $19, respectively) (19) (18) (53) (60)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(139), $(149), $(513) and $(426), respectively) 459 448 1,280 1,365
Other comprehensive income, net of tax 5,277 1,512 8,177 3,733
Comprehensive income 53,439 41,861 185,113 166,000
Net income attributable to non-controlling interest (4,050) (4,066) (11,347) (11,844)
Comprehensive income available for common stock 49,389 37,795 173,766 154,156
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 657 544 1,743 1,630
Commodity Contract        
Other comprehensive income (loss), net of tax:        
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax (250) 137 (269) 562
Net unrealized gains (losses) on commodity derivatives (net of tax of $(1,437), $(112), $(1,776) and $(44), respectively) $ 4,430 $ 401 $ 5,476 $ 181