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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 48,435 $ 48,954
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 28,934 29,673
Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 17,580 16,811
Accumulated amortization $ 8,288 7,209
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 $ 1,921 2,470
Accumulated amortization $ 4,388 $ 4,100
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