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Reclassifications out of accumulated other comprehensive (loss) (Details 10) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | $ (84,614) | $ (82,788) | $ (87,848)
Income taxes | (47,485) | (65,041) | (93,132)
Other income | (238) | 8,767 | 5,167
Net income (loss) | 272,318 | 281,203 | $ (67,258)
Reclassification out of accumulated other comprehensive income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | (2,715) | (1,499) |
Reclassification adjustment for loss on derivative instruments included in net income (loss): | Reclassification out of accumulated other comprehensive income | Interest rate contract |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | (591) | (590) |
Income taxes | 429 | 224 |
Net income (loss) | (162) | (366) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | Reclassification out of accumulated other comprehensive income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 721 | 645 |
Other income | (2,894) | (1,658) |
Net income (loss) | (2,173) | (1,013) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) | Reclassification out of accumulated other comprehensive income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 75 | 0 |
Other income | (324) | 0 |
Net income (loss) | (249) | 0 |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | Reclassification out of accumulated other comprehensive income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 35 | 65 |
Other income | (166) | (185) |
Net income (loss) | $ (131) | $ (120) |

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