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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income (loss) $ 272,662 $ 191,276 $ 82,631
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]      
Benefit plan liability adjustments - net gain (loss) (net of tax of $(660), $1,030 and $757, respectively) 2,155 (1,890) (1,738)
Benefit plan liability adjustments - prior service (costs) (net of tax of $0, $0 and $107, respectively) 0 0 (247)
Reclassification adjustment of benefit plan liability - net gain (loss) (net of tax of $(586), $(585) and $(600), respectively) 1,901 1,072 1,378
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $43, $69 and $67, respectively) (135) (128) (154)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]      
Other comprehensive income (loss), net of tax 7,027 681 (25,828)
Comprehensive income 279,689 191,957 56,803
Net income attributable to noncontrolling interest (14,220) (14,242) (9,661)
Comprehensive income available for common stock 265,469 177,715 47,142
Interest rate swaps      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]      
Net unrealized gains (losses) net of tax 0 0 (20,302)
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax 2,252 1,912 2,534
Commodity derivatives      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]      
Net unrealized gains (losses) net of tax 755 231 (361)
Reclassification of net realized (gains) losses on settled/amortized derivatives, net of tax $ 99 $ (516) $ (6,938)