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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Total $ 47,092 $ 48,954
Tradenames [Member]    
Finite Lived Intangible Assets [Line Items]    
Total 28,273 29,673
Referral Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Total 16,527 16,811
Accumulated amortization $ 7,729 7,209
Referral Relationships [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 6 years  
Referral Relationships [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 16 years  
Non-compete Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Total $ 2,292 2,470
Accumulated amortization $ 4,297 $ 4,100
Non-compete Agreements [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 5 years  
Non-compete Agreements [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life 6 years