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Pension plan and 401(k) Program - Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Retirement Benefits [Abstract]  
2020 $ 1,866
2021 1,487
2022 1,514
2023 1,455
2024 1,563
Years 2025 - 2029 $ 8,254