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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | $ (20,766) | $ (22,219) | $ (41,068) | $ (45,087)
Income taxes | (15,290) | (21,320) | (27,478) | (29,620)
Other income | 782 | 872 | 1,798 | 1,921
Net income (loss) | 41,215 | (229,804) | 78,539 | (215,974)
Reclassification from accumulated other comprehensive income, current period, net of tax | (435) | (375) | (918) | 1,095
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 | 91 | 183 | 183
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) | (147) | (295) | (297)
Income taxes | 56 | 56 | 112 | 114
Net income (loss) | (92) | (91) | (183) | (183)
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 | 312 | 248 | 669 | (1,347)
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 | 190 | 150 | 406 | (819)
Net periodic benefit cost (credit) | (502) | (398) | (1,075) | 2,166
Net income (loss) | (312) | (248) | (669) | 1,347
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 | 31 | 36 | 66 | 69
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 | 17 | 19 | 36 | 37
Other income | (48) | (55) | (102) | (106)
Net income (loss) | $ (31) | $ (36) | $ (66) | $ (69)

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