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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net income $ 26,544 $ 35,846 $ 143,924 $ 156,870
Other comprehensive income (loss), net of tax:        
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $--, $8, $-- and $14, respectively) 0 (14) 0 (32)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(27), $(68), $(43) and $(113), respectively) 16 119 44 262
Net unrealized gains (losses) on commodity derivatives (net of tax of $(35), $734, $233 and $394, respectively) 112 (2,314) (743) (1,267)
Other comprehensive income (loss), net of tax 1,035 (2,738) 2,255 (2,732)
Comprehensive income 27,579 33,108 146,179 154,138
Less: comprehensive income attributable to non-controlling interest (3,491) (2,431) (6,787) (5,929)
Comprehensive income available for common stock 24,088 30,677 139,392 148,209
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 536 475 1,099 1,011
Commodity derivatives        
Other comprehensive income (loss), net of tax:        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax $ 371 $ (1,004) $ 1,855 $ (2,706)