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Pension Benefits - Benefit obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Projected benefit obligation at beginning of the year	$ 2,591	$ 3,121
Service cost	289	344
Interest cost	194	198
Actuarial loss (gain)	1,720	(622)
Foreign currency exchange rates changes	52	(237)
Benefits paid	(235)	(213)
Projected benefit obligation at end of the year	$ 4,611	$ 2,591

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of cost recognized for passage of time related to defined benefit plan.

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