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Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Retirement Benefits [Abstract] |  |
Current portion of pension benefit obligation in wages and benefits payable | $ 3,822 | $ 3,069
Long-term portion of pension benefit obligation | 114,771 | 119,457
Pension benefit obligation, net | $ 118,593 | $ 122,526

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