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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net income (loss) $ (67,258) $ (657,691) $ 294,338
Net unrealized gain on derivative instruments qualifying as hedges:      
Reclassification adjustment for loss on derivative instruments included in net income (loss), net of tax of $226, $233 and $240 in 2016, 2015 and 2014, respectively 367 404 399
Reclassification adjustment for loss on derivative instruments included in income (loss) from discontinued operations, net of tax of $0, $0 and $173 in 2016, 2015 and 2014, respectively 0 0 295
Net unrealized gain on derivative instruments qualifying as hedges 367 404 694
Postretirement liability adjustment:      
Postretirement liability losses arising during the period, net of tax of $(836), $(55) and $(7,665) in 2016, 2015 and 2014, respectively (1,470) (88) (12,409)
Amortization of postretirement liability losses included in net periodic benefit cost (credit), net of tax of $1,425, $1,128 and $492 in 2016, 2015 and 2014, respectively 2,506 1,794 796
Reclassification of postretirement liability adjustment to regulatory asset, net of tax of $0, $1,416 and $4,509 in 2016, 2015 and 2014, respectively 0 2,255 7,202
Postretirement liability adjustment 1,036 3,961 (4,411)
Foreign currency translation adjustment:      
Foreign currency translation adjustment recognized during the period, net of tax of $31, $(105) and $(99) in 2016, 2015 and 2014, respectively 51 (173) (162)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss), net of tax of $0, $490 and $0 in 2016, 2015 and 2014, respectively 0 802 0
Foreign currency translation adjustment 51 629 (162)
Net unrealized loss on available-for-sale investments:      
Net unrealized loss on available-for-sale investments arising during the period, net of tax of $(98), $(91) and $(83) in 2016, 2015 and 2014, respectively (182) (170) (154)
Reclassification adjustment for loss on available-for-sale investments included in net income (loss), net of tax of $77, $70 and $73 in 2016, 2015 and 2014, respectively 143 131 135
Net unrealized loss on available-for-sale investments (39) (39) (19)
Other comprehensive income (loss) 1,415 4,955 (3,898)
Comprehensive income (loss) (65,843) (652,736) 290,440
Loss from discontinued operations attributable to noncontrolling interest (131,691) (35,256) (3,895)
Comprehensive income (loss) attributable to common stockholders $ 65,848 $ (617,480) $ 294,335