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Pension Benefits - Net periodic pension cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Service cost	$ 492	$ 289
Interest cost	249	194
Actuarial gain (loss) recognized	50	(148)
Net periodic pension cost	$ 791	$ 335

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Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation.

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

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