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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 242,763 $ 213,322 $ 272,662
Other comprehensive income (loss), net of tax:      
Benefit plan liability adjustments - net gain (loss) (net of tax of $191, $1,886 and $(660), respectively) (1,062) (6,253) 2,155
Benefit plan liability adjustments - prior service costs (net of tax of $0, $2 and $0 respectively) 0 (8) 0
Reclassification adjustment of benefit plan liability - net loss (net of tax of $(958), $434 and $(586), respectively) 1,429 1,179 1,901
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $23, $19 and $43, respectively) (80) (58) (135)
Other comprehensive income (loss), net of tax 3,309 (3,739) 7,027
Comprehensive income 246,072 209,583 279,689
Less: comprehensive income attributable to non-controlling interest (15,155) (14,012) (14,220)
Comprehensive income available for common stock 230,917 195,571 265,469
Interest rate swaps      
Other comprehensive income (loss), net of tax:      
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 2,564 2,185 2,252
Commodity derivatives      
Other comprehensive income (loss), net of tax:      
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 505 (362) 99
Net unrealized gains (losses) on commodity derivatives (net of tax of $14, $126 and $(228), respectively) $ (47) $ (422) $ 755