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GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Remaining in 2021 $ 6,532      
2022 6,420      
2023 5,102      
2024 4,384      
2025 3,826      
2026 3,252      
Thereafter 10,144      
Total anticipated intangible amortization $ 39,660 $ 41,692 $ 50,151 $ 52,810