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GOODWILL AND OTHER INTANGIBLE ASSETS - Expected Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 (three months) $ 7,526  
2022 30,002  
2023 25,674  
2024 24,180  
2025 23,208  
Thereafter 132,725  
Finite-lived intangible assets, net $ 243,315 $ 263,464