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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

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