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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income (loss) |  | $ (417,124) | $ (113,891) | $ 104,468
Other comprehensive income, net of taxes: |  |  |  |
Reclassification adjustment for settled cash flow hedge contracts | [1] | 0 | 0 | 86,726
Changes in fair value of cash flow hedge contracts | [2] | 0 | 0 | (80,175)
Postretirement benefits: |  |  |  |
Net gain (loss) | [3] | 1,794 | 1,786 | (325)
Prior service cost | [4] | (514) | 0 | 0
Amortization of prior service cost | [5] | 70 | 0 | 0
Amortization of net (gain) loss | [6] | 0 | 0 | (16)
Total other comprehensive income |  | 1,350 | 1,786 | 6,210
Comprehensive income (loss) |  | $ (415,774) | $ (112,105) | $ 110,678
[1] | Net of income taxes of $(57,477) for the year ended December 31, 2014.
[2] | Net of income taxes of $53,135 for the year ended December 31, 2014.
[3] | Net of income taxes of $(1,052), $(1,043) and $48 for the year ended December 31, 2016, 2015 and 2014, respectively.
[4] | Net of income taxes of $301 for the year ended December 31, 2016.
[5] | Net of income taxes of $(41) for the year ended December 31, 2016.
[6] | Net of income taxes of $10 for the year ended December 31, 2014.

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