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Pension benefits (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 344	$ 333
Interest cost	198	187
Past service cost	34	0
Curtailment	0	(69)
Actuarial Gain Loss Recognized	133	(249)
Net periodic pension cost	$ 709	$ 202

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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