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Long-Term Debt - Schedule of Annual Principal Repayments (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2018 $ 14,914
2019 33,306
2020 10,089
2021 5,297
2022 17,500
2023 428,625
Totals $ 509,731