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Commitments and Contingencies - Schedule of Minimum Principal Payments Due on Long-term Debt (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Mandatory prepayment pursuant to excess cash flow $ 4,200
2019 2,187
2020 4,375
2021 4,375
2022 4,375
2023 146,788
Thereafter $ 0