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Employee Benefit Plans - Future benefits payable for Retirement Income Plan over next ten years (Details) - Retirement Income Plan
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2,764
2021 2,858
2022 2,899
2023 2,919
2024 2,987
2025-2029 $ 15,211