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Goodwill and Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 847  
2019 2,642  
2020 2,071  
2021 1,520  
Thereafter 1,664  
Net intangible assets, end of period $ 8,744 $ 12,275