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GOODWILL AND LONG-LIVED ASSETS - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining amounts in 2021 $ 2,153  
2022 8,398  
2023 7,229  
2024 3,544  
2025 1,974  
Thereafter 2,512  
Net Carrying Value $ 25,810 $ 30,151