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Benefit Plans - Defined Benefit Plans - Estimated Benefit Payments over the Next Ten Years (Details) - Supplemental Retirement Plan
$ in Thousands
Dec. 31, 2017
USD ($)
Estimated Benefit Payments  
2018 $ 1,085
2019 1,592
2020 1,604
2021 1,648
2022 1,814
2023 to 2027 9,970
Total $ 17,713