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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 478 $ 371
Tradenames [Member]    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses 21 22
Referral Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses 323 245
Non-compete Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 134 $ 104