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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Net income (loss) | $ (16,163) | $ 73,779
Other comprehensive income (loss) before income tax effect: |  |
Net gain on foreign currency cash flow hedges reclassified as income | (46) | (47)
Defined benefit plans and other postretirement benefits: |  |
Amortization of prior service benefit during the period | (667) | (936)
Amortization of actuarial net loss during the period | 1,919 | 1,444
Other comprehensive income before income tax effect | 1,206 | 461
Income tax effect | (383) | (383)
Other comprehensive income | 823 | 78
Total comprehensive income (loss) | $ (15,340) | $ 73,857

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