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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income $ 270,758 $ 251,260 $ 242,763
Other comprehensive income (loss), net of tax:      
Benefit plan liability adjustments - net gain (loss) (net of tax of $(1,505), $(664) and $191, respectively) 4,604 1,959 (1,062)
Reclassification adjustment of benefit plan liability - net loss (net of tax of $(226), $(665) and $(958), respectively) 525 1,726 1,429
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $28, $27 and $23, respectively) (65) (71) (80)
Net unrealized gains (losses) on commodity derivatives (net of tax of $193, $(980) and $14, respectively) (631) 3,023 (47)
Other comprehensive income (loss), net of tax 4,517 7,262 3,309
Comprehensive income 275,275 258,522 246,072
Less: comprehensive income attributable to non-controlling interest (12,371) (14,516) (15,155)
Comprehensive income available for common stock 262,904 244,006 230,917
Interest rate swaps      
Other comprehensive income (loss), net of tax:      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 2,129 2,174 2,564
Commodity derivatives      
Other comprehensive income (loss), net of tax:      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax $ (2,045) $ (1,549) $ 505