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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Total goodwill $ 309,505,000 $ 309,505,000 $ 309,505,000
Goodwill, accumulated impairment $ 0