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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) |  | $ 17,587 | $ (10,260) | $ 144,834 | $ (124,364)
Postretirement benefits: |  |  |  |  |
Net gain | [1] | (1,429) | 0 | (1,429) | 0
Prior service credit | [2] | 5,449 | 0 | 5,449 | 0
Amortization of prior service cost | [3] | (1,551) | 17 | (1,523) | 52
Amortization of gain | [4] | 287 | 0 | 0 | 0
Total other comprehensive income (loss) |  | 2,756 | 17 | 2,497 | 52
Comprehensive income (loss) |  | $ 20,343 | $ (10,243) | $ 147,331 | $ (124,312)
[1] | Net of income taxes of $837 for the three and nine months ended September 30, 2017.
[2] | Net of income taxes of $(3,194) for the three months and nine months ended September 30, 2017.
[3] | Net of income taxes of $909 and $(10) for the three months ended September 30, 2017 and 2016, respectively, and $893 and $(31) for the nine months ended September 30, 2017 and 2016, respectively.
[4] | Net of income taxes of $(168) for the three months ended September 30, 2017.

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