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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 370 $ 190 $ 741 $ 432
Tradenames [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 21 0 42 0
Referral relationships [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 245 128 491 283
Non-compete agreements [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 104 $ 62 $ 208 $ 149