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Employee benefit plans - Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |
Net loss (gain) | $ 6,628 | $ 6,946 |
Pension Benefits |  |  |
Net periodic pension cost: |  |  |
Interest cost | 650 | 665 | $ 696
Expected return on plan assets | (915) | (893) | (931)
Amortization of unrecognized net gain | 195 | 209 | 198
Net periodic pension cost | (70) | (19) | (37)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |
Net loss (gain) | 318 | 917 | 296
Deferred tax | (67) | (321) | (104)
Total recognized in other comprehensive income | 251 | 596 | 192
Total recognized in net period pension cost and other comprehensive income | 181 | $ 577 | $ 155
Estimated net loss for defined benefit pension plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over next fiscal year | $ 19 |  |

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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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