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INTANGIBLE ASSETS, NET - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 (excluding the nine months ended September 30, 2021) $ 828
2022 3,264
2023 3,156
2024 2,992
2025 2,848
Thereafter 11,967
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 (excluding the nine months ended September 30, 2021) 138
2022 412
2023 343
2024 287
2025 221
Thereafter $ 174