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Revolving Credit Facility and Long-Term Debt - Future Minimum Payments on Long-term Debt (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Disclosure [Abstract]  
Remaining 2018 $ 3,750
2019 22,000
2020 17,500
2021 166,000
Total future minimum principal payments $ 209,250