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Pension Benefits - Recognized in balance sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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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