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Pension and Post-retirement Plans - Projected and Accumulated Benefit Obligations (Details) - Pension obligations - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 79,866 $ 110,410
Fair value of project plan assets 77,035 105,358
Accumulated benefit obligation 41,654 36,001
Fair value of accumulated plan assets $ 39,105 $ 33,509