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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, 2021	Mar. 31, 2020
Components of net periodic benefit cost
Service cost	$ 463	$ 441
Interest cost	221	319
Expected return on plan assets	(946)	(817)
Recognized net actuarial loss	720	648
Net periodic pension cost	$ 458	$ 591

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

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