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Reclassifications out of accumulated other comprehensive (loss) (Details 13) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | $ (82,788) | $ (87,848) | $ (91,179)
Income taxes | (65,041) | (93,132) | (70,664)
Other income | 4,103 | 4,956 | 18,457
Net income (loss) | 281,203 | (67,258) | $ (657,691)
Amounts reclassified from accumulated other comprehensive loss | (1,499) | (3,016) |
Reclassification adjustment for loss on derivative instruments included in net income (loss): |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive loss | 366 | 367 |
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 | (590) | (593) |
Income taxes | 224 | 226 |
Net income (loss) | (366) | (367) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive loss | 1,013 | 2,506 |
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 | 645 | 1,425 |
Net periodic benefit cost | (1,658) | (3,931) |
Net income (loss) | (1,013) | (2,506) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive loss | 120 | 143 |
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 | 65 | 77 |
Other income | (185) | (220) |
Net income (loss) | $ (120) | $ (143) |

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