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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 53,385 $ 48,828
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 32,049 30,256
Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 18,967 16,895
Accumulated amortization $ 10,714 9,370
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 $ 2,369 1,677
Accumulated amortization $ 4,901 $ 4,716
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