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Debt - Future Payments (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Disclosure [Abstract]  
Remainder of Year Ending December 31, 2018 $ 0
Year Ending December 31, 2019 21,417
Year Ending December 31, 2020 0
Year Ending December 31, 2021 0
Year Ending December 31, 2022 320,000
Thereafter 0
Total $ 341,417