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Employee Benefit Plans (Expected Contributions and Future Benefit Payments) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Employer Contributions |
Expected 2018 Contributions by Employer | $ 3,898
Future Expected Benefit Payments |
2018 | 413
2019 | 676
2020 | 869
2021 | 983
2022 | 1,099
2023-2027 | $ 7,672

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