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Pension benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Amortization of transition obligation	$ 41	$ 38
Actuarial gain (loss)	416	(226)
Totals	457	(188)
Amounts in accumulated other comprehensive loss not yet reflected in net periodic pension cost, net of taxes:
Actuarial gain	1,747	1,331
Transition obligation	(91)	(132)
Totals	1,656	$ 1,199
Amounts in accumulated other comprehensive loss expected to be amortized in 2019 net periodic pension cost, net of taxes:
Actuarial gain	(195)
Transition obligation	36
Totals	$ (159)

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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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Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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