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Reclassifications out of accumulated other comprehensive (loss) (Details 14) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | $ (87,848) | $ (91,179) | $ (86,871)
Income taxes | (93,132) | (70,664) | (64,422)
Other income | 4,956 | 18,457 | 9,138
Net income (loss) | (67,258) | (657,691) | $ 294,338
Reclassification from accumulated other comprehensive income, current period, net of tax | (3,016) | (3,131) |
Reclassification adjustment for loss on derivative instruments included in net income (loss): |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 367 | 404 |
Reclassification adjustment for loss on derivative instruments included in net income (loss): | Reclassification out of accumulated other comprehensive income [Member] | Interest rate contract [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | (593) | (637) |
Income taxes | 226 | 233 |
Net income (loss) | (367) | (404) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 2,506 | 1,794 |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | Reclassification out of accumulated other comprehensive income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 1,425 | 1,128 |
Net periodic benefit cost | (3,931) | (2,922) |
Net income (loss) | (2,506) | (1,794) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 0 | 802 |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) | Reclassification out of accumulated other comprehensive income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 0 | 490 |
Other income | 0 | (1,292) |
Net income (loss) | 0 | (802) |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 143 | 131 |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | Reclassification out of accumulated other comprehensive income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 77 | 70 |
Other income | (220) | (201) |
Net income (loss) | $ (143) | $ (131) |

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