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Pension benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of transition obligation | $ 43 | $ 40 | $ 39
Actuarial gain (loss) | (179) | 986 | 574
Totals | 136 | (1,026) | $ (613)
Amounts in accumulated other comprehensive loss not yet reflected in net periodic pension cost, net of taxes: |  |  |
Actuarial gain | 1,557 | 1,736 |
Transition obligation | (170) | (213) |
Totals | 1,387 | $ 1,523 |
Amounts in accumulated other comprehensive loss expected to be amortized in 2017 net periodic pension cost, net of taxes: |  |  |
Actuarial gain | (286) |  |
Transition obligation | 38 |  |
Totals | $ (248) |  |

X
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- Definition Amount of actuarial gain (loss) not reflected in net periodic pension cost, net of tax. + References No definition available. + Details
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- Definition The amounts in accumulated other comprehensive income transition obligation that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
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- Definition Amount of actuarial gain (loss) not reflected in net periodic pension cost, net of tax. + References No definition available. + Details
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- Definition The amount of the transition obligation or asset recognized in net periodic benefit cost. + 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)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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