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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net income $ 48,760 $ 37,834 $ 192,684 $ 194,704
Other comprehensive income (loss), net of tax:        
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $--, $8, $-- and $22, respectively) 0 (16) 0 (48)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(19), $(66), $(62) and $(179), respectively) 24 122 67 384
Net unrealized gains (losses) on commodity derivatives (net of tax of $58, $(559), $291 and $(165), respectively) (195) 1,776 (937) 509
Other comprehensive income (loss), net of tax 405 2,427 2,660 (305)
Comprehensive income 49,165 40,261 195,344 194,399
Less: comprehensive income attributable to non-controlling interest (3,377) (2,861) (10,164) (8,790)
Comprehensive income available for common stock 45,788 37,400 185,180 185,609
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax 550 578 1,649 1,589
Commodity derivatives        
Other comprehensive income (loss), net of tax:        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax $ 26 $ (33) $ 1,881 $ (2,739)