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Pension Benefits - Recognized in balance sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Current accrued benefit cost	$ 332	$ 570
Non-current accrued benefit cost	5,608	4,041
Total amount recognized	$ 5,940	$ 4,611

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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