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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | $ (20,909) | $ (22,278) | $ (61,978) | $ (67,365)
Income taxes | (46,930) | (37,761) | (74,406) | (67,381)
Other income | 1,011 | 1,741 | 2,809 | 3,662
Net income (loss) | 87,351 | 82,986 | 165,891 | (132,988)
Reclassification from accumulated other comprehensive income, current period, net of tax | (452) | (361) | (1,370) | 730
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 | 92 | 92 | 275 | 275
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 | (148) | (148) | (443) | (445)
Income taxes | 56 | 56 | 168 | 170
Net income (loss) | (92) | (92) | (275) | (275)
Amortization of postretirement liability gains (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 | 333 | 236 | 1,002 | (1,111)
Amortization of postretirement liability gains (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 | 203 | 143 | 609 | (676)
Net periodic benefit cost (credit) | (536) | (379) | (1,611) | 1,787
Net income (loss) | (333) | (236) | (1,002) | 1,111
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 | 27 | 33 | 93 | 106
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 | 14 | 18 | 50 | 57
Other income | (41) | (51) | (143) | (163)
Net income (loss) | $ (27) | $ (33) | $ (93) | $ (106)

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