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Employee Benefit Plans (Expected Contributions and Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Employer Contributions  
Expected 2020 Contributions by Employer $ 5,850
Future Expected Benefit Payments  
2020 824
2021 1,112
2022 1,343
2023 1,537
2024 1,714
2025-2029 $ 11,250