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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 3,970  
2018 15,693  
2019 15,468  
2020 14,156  
2021 8,253  
Thereafter 17,918  
Net Book Value $ 75,458 $ 81,843