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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | $ (20,955) | $ (20,909) | $ (62,202) | $ (61,978)
Other income | 2,683 | 2,068 | 4,864 | 6,212
Income taxes | (14,363) | (46,930) | (32,629) | (74,406)
Total reclassifications | 107,251 | 87,351 | 193,490 | 165,891
Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Total reclassifications | (567) | (452) | (1,934) | (1,370)
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive income | Interest rate contract |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | (147) | (148) | (443) | (443)
Income taxes | 55 | 56 | 164 | 168
Total reclassifications | (92) | (92) | (279) | (275)
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] |  |  |  |
Other income | (584) | (536) | (1,751) | (1,611)
Income taxes | 142 | 203 | 442 | 609
Total reclassifications | (442) | (333) | (1,309) | (1,002)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income | Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Other income | 0 | 0 | (324) | 0
Income taxes | 0 | 0 | 75 | 0
Total reclassifications | 0 | 0 | (249) | 0
Reclassification adjustment for loss on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Other income | (42) | (41) | (123) | (143)
Income taxes | 9 | 14 | 26 | 50
Total reclassifications | $ (33) | $ (27) | $ (97) | $ (93)

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