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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 ($)
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Compensation and Retirement Disclosure [Abstract] |
2019 | $ 2,359
2020 | 2,627
2021 | 2,869
2022 | 3,078
2023 | 3,262
2024-2028 | $ 17,984

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