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Pension and Post-retirement Plans - Projected and Accumulated Benefit Obligations (Details) - Pension obligations - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 35,963 $ 79,866
Fair value of project plan assets 33,966 77,035
Accumulated benefit obligation 35,249 41,654
Fair value of accumulated plan assets $ 33,966 $ 39,105