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Long-Term Debt - Schedule of Annual Principal Repayments (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]  
2018 $ 13,021
2019 36,966
2020 10,190
2021 6,505
2022 19,500
2023 428,625
Totals $ 514,807