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Employee Benefit Plans - Estimated future benefit payments including benefits attributable to future service (Details 4)
$ in Thousands
Jun. 30, 2018
USD ($)
Compensation and Retirement Disclosure [Abstract]  
2019 $ 2,359
2020 2,627
2021 2,869
2022 3,078
2023 3,262
2024-2028 $ 17,984