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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income (loss) |  | $ 100,393 | $ (417,124) | $ (113,891)
Postretirement benefits: |  |  |  |
Net gain (loss) | [1] | (2,634) | 1,794 | 1,786
Prior service credit (cost) | [2] | 5,449 | (514) | 0
Amortization of prior service cost | [3] | (1,723) | 70 | 0
Total other comprehensive income |  | 1,092 | 1,350 | 1,786
Comprehensive income (loss) |  | $ 101,485 | $ (415,774) | $ (112,105)
[1] | Net of income taxes of $1,544, $(1,052) and $(1,043) for the year ended December 31, 2017, 2016 and 2015, respectively.
[2] | Net of income taxes of $(3,194) and $301 for the year ended December 31, 2017 and 2016, respectively.
[3] | Net of income taxes of $1,010 and $(41) for the year ended December 31, 2017 and 2016, respectively.

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