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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 687 $ 520 $ 1,340 $ 998
Tradenames [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 0 21 0 42
Referral Relationships [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses 481 352 939 675
Non-compete Agreements [Member]        
Finite Lived Intangible Assets [Line Items]        
Total amortization expenses $ 206 $ 147 $ 401 $ 281