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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, 2017 | Mar. 31, 2016
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Interest expense | $ (20,303) | $ (22,868)
Income taxes | (12,188) | (8,301)
Other income | 1,017 | 1,049
Net income | 37,325 | 13,829
Reclassification from accumulated other comprehensive income, current period, net of tax | (483) | 1,467
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 | 91 | 92
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive income [Member] | Interest rate contract [Member] |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Interest expense | (147) | (149)
Income taxes | 56 | 57
Net income | (91) | (92)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Reclassification from accumulated other comprehensive income, current period, net of tax | 357 | (1,595)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost | Reclassification out of accumulated other comprehensive income [Member] |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Income taxes | 217 | (969)
Net periodic benefit cost | (574) | 2,564
Net income | (357) | 1,595
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 | 35 | 36
Reclassification adjustment for loss on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive income [Member] |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |
Income taxes | 19 | 19
Other income | (54) | (55)
Net income | $ (35) | $ (36)

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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