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Employee Benefit Plans (Expected Contributions and Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Employer Contributions  
Expected 2019 Contributions by Employer $ 3,550
Future Expected Benefit Payments  
2019 587
2020 816
2021 962
2022 1,109
2023 1,265
2024-2028 $ 8,465