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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of net periodic benefit cost
Service cost	$ 419	$ 368	$ 1,257	$ 1,104
Interest cost	320	392	960	1,176
Expected return on plan assets	(811)	(756)	(2,433)	(2,268)
Recognized net actuarial loss	611	412	1,833	1,236
Net periodic pension cost	$ 539	$ 416	$ 1,617	$ 1,248

X

- Definition

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

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- Definition

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

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