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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 60,086 $ 56,280
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 33,456 32,317
Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 25,055 22,119
Accumulated amortization $ 16,934 14,522
Referral Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 6 years  
Referral Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 13 years  
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 1,575 1,844
Accumulated amortization $ 6,313 $ 5,993
Non-compete Agreements [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 5 years  
Non-compete Agreements [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 6 years