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Debt - Long-term debt payable in the next five years (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
Long-term debt payable in 2018 $ 475,143
Long-term debt payable in 2019 100,107
Long-term debt payable in 2020 468,822
Long-term debt payable in 2021 32
Long-term debt payable in 2022 $ 114,280