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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Estimated future intangible asset amortization expense    
2018 $ 4,959  
2019 3,617  
2020 3,329  
2021 1,317  
2022 917  
Thereafter 0  
Total $ 14,139 $ 14,536