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Employee Benefit Plans - Schedule of Estimated Future Benefit Payments (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Estimated future benefit payments |
2018 | $ 1,686
2019 | 1,816
2020 | 1,873
2021 | 1,898
2022 | 2,002
Years 2023 - 2027 | $ 9,237

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