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Defined Benefit Pension Obligation - Estimated Contributions and Future Benefit Payments (Details) - Defined benefit pension plan
$ in Thousands
Jun. 30, 2018
USD ($)
Future Benefit Payments  
2019 $ 1,093
2020 1,006
2021 942
2022 894
2023 858
Thereafter 4,820
Total $ 9,613