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Employee Benefit Plans (Future Benefit Payments Under Defined Benefit Pension Plan) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Future Benefit Payments  
2018 $ 6,748
2019 6,798
2020 6,781
2021 6,785
2022 6,721
2023-2027 32,410
Total future benefit payments $ 66,243