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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 520 $ 369 $ 1,518 $ 1,109
Tradenames [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 20 20 62 62
Referral Relationships [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 352 245 1,027 736
Non-compete Agreements [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 148 $ 104 $ 429 $ 311