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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 369 $ 612 $ 1,109 $ 1,044
Tradenames [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 20 0 62 0
Referral Relationships [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 245 471 736 754
Non-compete Agreements [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 104 $ 141 $ 311 $ 290