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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income (loss) |  | $ 557,043 | $ 100,393 | $ (417,124)
Postretirement benefits: |  |  |  |
Net gain (loss) | [1] | 2,461 | (2,634) | 1,794
Prior service credit (cost) | [2] | 0 | 5,449 | (514)
Amortization of prior service cost | [3] | (547) | (1,723) | 70
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings |  | 446 | 0 | 0
Total other comprehensive income |  | 2,360 | 1,092 | 1,350
Comprehensive income (loss) |  | $ 559,403 | $ 101,485 | $ (415,774)
[1] | Net of income taxes of $(704), $1,544 and $(1,052) for the year ended December 31, 2018, 2017 and 2016, respectively.
[2] | Net of income taxes of $0, $(3,194) and $301 for the year ended December 31, 2018, 2017 and 2016, respectively.
[3] | Net of income taxes of $162, $1,010 and $(41) for the year ended December 31, 2018, 2017 and 2016, respectively.

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