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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income $ 251,260 $ 242,763 $ 213,322
Other comprehensive income (loss), net of tax:      
Benefit plan liability adjustments - net gain (loss) (net of tax of $(664), $191 and $1,886, respectively) 1,959 (1,062) (6,253)
Benefit plan liability adjustments - prior service costs (net of tax of $0, $0 and $2 respectively) 0 0 (8)
Reclassification adjustment of benefit plan liability - net loss (net of tax of $(665), $(958) and $434, respectively) 1,726 1,429 1,179
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $27, $23 and $19, respectively) (71) (80) (58)
Other comprehensive income (loss), net of tax 7,262 3,309 (3,739)
Comprehensive income 258,522 246,072 209,583
Less: comprehensive income attributable to non-controlling interest (14,516) (15,155) (14,012)
Comprehensive income available for common stock 244,006 230,917 195,571
Interest rate swaps      
Other comprehensive income (loss), net of tax:      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 2,174 2,564 2,185
Commodity derivatives      
Other comprehensive income (loss), net of tax:      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax (1,549) 505 (362)
Net unrealized gains (losses) on commodity derivatives (net of tax of $(980), $14 and $126, respectively) $ 3,023 $ (47) $ (422)