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INTANGIBLE ASSETS, NET - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2020 (excluding the three months ended March 31, 2020) $ 1,911
2021 2,549
2022 2,500
2023 2,393
2024 2,228
Thereafter 7,773
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2020 (excluding the three months ended March 31, 2020) 545
2021 665
2022 489
2023 419
2024 363
Thereafter $ 264