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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]    
Total $ 15,727 $ 14,479
Tradenames [Member]
    
Finite Lived Intangible Assets [Line Items]    
Total 10,714 9,814
Referral relationships [Member]
    
Finite Lived Intangible Assets [Line Items]    
Total 4,216 3,959
Accumulated amortization 1,865 1,582
Non-competition agreements [Member]
    
Finite Lived Intangible Assets [Line Items]    
Total 797 706
Accumulated amortization $ 2,099 $ 1,950