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Pension Benefits - Recognized in balance sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Current accrued benefit cost	$ 677	$ 332
Non-current accrued benefit cost	6,162	5,608
Total amount recognized	$ 6,839	$ 5,940

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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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