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ACQUISITIONS - CarePoint Business (Details)
12 Months Ended
Aug. 23, 2013
USD ($)
state
patient
location
Dec. 31, 2015
USD ($)
Minimum | Customer relationships    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   5 months
Minimum | Trademarks    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   23 months
Minimum | Non-compete agreements    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   1 year
Maximum | Customer relationships    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   4 years
Maximum | Trademarks    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   3 years
Maximum | Non-compete agreements    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives   5 years
CarePoint Partners Holding LLC    
Business Acquisition [Line Items]    
Number of patients | patient 20,500  
Number of locations | location 28  
Number of states with sites of service in East Coast and Gulf Coat regions | state 9  
Cash purchase price paid $ 211,100,000  
Net working capital adjustments due (1,800,000)  
Total possible contingent consideration increase 10,000,000  
Initial fair value of contingent consideration 9,800,000  
Additional expense to be recorded for contingent consideration if earned   $ 5,400,000
Additional income to be recorded if contingent consideration is reversed   4,600,000
Identifiable intangible assets 16,700,000  
Fair value of contingent consideration   $ 4,600,000
CarePoint Partners Holding LLC | Customer relationships    
Business Acquisition [Line Items]    
Identifiable intangible assets $ 13,600,000  
CarePoint Partners Holding LLC | Trademarks    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives 2 years  
Identifiable intangible assets $ 2,600,000  
CarePoint Partners Holding LLC | Non-compete agreements    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives 5 years  
Identifiable intangible assets $ 500,000  
CarePoint Partners Holding LLC | Minimum | Customer relationships    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives 2 years  
CarePoint Partners Holding LLC | Maximum | Customer relationships    
Business Acquisition [Line Items]    
Weighted- Average Useful Lives 4 years  
CarePoint Partners Holding LLC | Senior Credit Facilities    
Business Acquisition [Line Items]    
Cash payment funded with borrowings $ 150,000,000