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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of net periodic benefit cost
Service cost	$ 387	$ 463
Interest cost	273	221
Expected return on plan assets	(1,050)	(946)
Amortization of net loss	500	720
Net periodic pension cost	$ 110	$ 458

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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