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Employee Benefit Plans - Future Benefit Payments for the Pension Plan (Details) - Pension Plan
$ in Thousands
Dec. 31, 2018
USD ($)
Expected future benefit payments used to determine projected benefit obligations  
2019 $ 3,241
2020 2,793
2021 2,410
2022 2,298
2023 2,478
2024 - 2028 $ 9,399