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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Estimated future intangible asset amortization expense    
2018 $ 3,646  
2019 3,356  
2020 1,317  
2021 917  
2022 0  
Thereafter 0  
Total $ 9,236 $ 14,139