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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 55,648 $ 52,588
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 33,549 32,049
Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 19,354 18,367
Accumulated amortization $ 12,290 11,677
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 16 years  
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 2,745 2,172
Accumulated amortization $ 5,601 $ 5,424
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