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Intangible Assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Total $ 30,296 $ 24,907  
Tradenames [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total 17,660 14,427  
Accumulated amortization $ 170 86  
Estimated useful life 6 years    
Referral Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total $ 10,866 8,951  
Accumulated amortization $ 3,763 2,610  
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    
Referral Relationships [Member] | Physician Services [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization     $ 156
Non-compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total $ 1,770 1,529  
Accumulated amortization $ 2,855 $ 2,377  
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    
Non-compete Agreements [Member] | Physician Services [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization     $ 270