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Pension benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Amortization of transition obligation	$ 38	$ 43
Actuarial loss	(226)	(179)
Totals	196	136
Amounts in accumulated other comprehensive loss not yet reflected in net periodic pension cost, net of taxes:
Actuarial gain	1,331	1,557
Transition obligation	(132)	(170)
Totals	1,199	$ 1,387
Amounts in accumulated other comprehensive loss expected to be amortized in 2018 net periodic pension cost, net of taxes:
Actuarial gain	(157)
Transition obligation	38
Totals	$ (119)

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- Definition

Amount of accumulated other comprehensive income (loss) not reflected in net periodic pension cost, net of tax.

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Amount of actuarial gain (loss) not reflected in net periodic pension cost, net of tax.

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The amounts in accumulated of actuarial gain.

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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.

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Amount of actuarial gain (loss) recognized in other comprehensive income (loss).

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Amount of actuarial gain (loss) not reflected in net periodic pension cost, net of tax.

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Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit 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 (h)(6)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Reference 1: 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

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