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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Total $ 48,321 $ 38,060
Tradenames [Member]    
Finite Lived Intangible Assets [Line Items]    
Total 26,352 21,234
Referral Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Total 18,613 14,859
Accumulated amortization $ 6,214 5,275
Referral Relationships [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 6 years  
Referral Relationships [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 16 years  
Non-compete Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Total $ 3,356 1,967
Accumulated amortization $ 3,781 $ 3,380
Non-compete Agreements [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 5 years  
Non-compete Agreements [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 6 years