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INTANGIBLE ASSETS, NET - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 (excluding the three months ended March 31, 2021) $ 2,333
2022 3,062
2023 2,954
2024 2,790
2025 2,647
Thereafter 9,999
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 (excluding the three months ended March 31, 2021) 402
2022 369
2023 299
2024 243
2025 176
Thereafter $ 102