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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Interest expense | $ (20,447) | $ (20,303)
Income taxes | (7,551) | (12,188)
Other income | 582 | 2,343
Net income | 42,437 | 37,325
Reclassification from accumulated other comprehensive income, current period, net of tax | (540) | (483)
Reclassification adjustment for loss on derivative instruments included in net income |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 92 | 91
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 | (148) | (147)
Income taxes | 56 | 56
Net income | (92) | (91)
Amortization of postretirement liability 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 | 418 | 357
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 | 155 | 217
Other income | (573) | (574)
Net income | (418) | (357)
Reclassification adjustment for loss on available-for-sale investments included in net income |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 30 | 35
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] |  |
Income taxes | 7 | 19
Other income | (37) | (54)
Net income | $ (30) | $ (35)

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