Employee Retirement Plans - Schedule of components of net periodic pension cost (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Employee Retirement Plans
Service cost	$ 102	$ 115
Interest cost	371	500
Expected return on plan assets	(720)	(690)
Net amortization and deferral	247	186
Pension expense	$ 0	$ 111

No definition available.

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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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- Definition

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

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- Definition

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

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- Definition

Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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No definition available.

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- Definition

The gain/loss and prior service cost amounts that were amortized and recognized as part of defined benefit pension cost during the year.

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