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Defined Benefit Pension Plans - Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Plan assets in other long-term assets | $ 0 | $ 44
Current portion of pension benefit obligation in wages and benefits payable | 3,069 | 2,885
Long-term portion of pension benefit obligation | 119,457 | 98,712
Pension benefit obligation, net | $ 122,526 | $ 101,553

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