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Debt - Long-term debt payable in the next five years (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
Long-term debt payable in 2019 $ 100,411
Long-term debt payable in 2020 240
Long-term debt payable in 2021 32
Long-term debt payable in 2022 116,841
Long-term debt payable in 2023 $ 300,006