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Pension and Other Post-Retirement Benefits - Projected benefit obligations, the plan assets, and the funded status (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Change in benefit obligation        
Service costs $ 368 $ 226 $ 1,104 $ 661
Interest cost $ 82 $ 79 $ 246 $ 235