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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
1 Months Ended
Sep. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2018
Sep. 19, 2018
Feb. 01, 2018
Dec. 07, 2017
Apr. 16, 2014
Fair Value Disclosures [Abstract]                
Fair value of debt     $ 4,000,000,000 $ 4,000,000,000        
Steward Health Care Systems, LLC [Member]                
Business Acquisition [Line Items]                
Estimated fair value of contingent consideration               $ 4,000,000
Shiel Holdings LLC (Shiel) [Member]                
Business Acquisition [Line Items]                
Estimated fair value of contingent consideration             $ 6,000,000  
Contingent consideration arrangements, range of outcomes, value, high     $ 15,000,000          
Comparable company revenue volatility     6.90%          
Discount rate     4.50%          
Shiel Holdings LLC (Shiel) [Member] | Level 3 [Member]                
Business Acquisition [Line Items]                
Estimated fair value of contingent consideration     $ 6,000,000 7,000,000        
Mobile Medical Examination Services, Inc. (MedXM) [Member]                
Business Acquisition [Line Items]                
Contingent consideration arrangements, range of outcomes, value, high           $ 30,000,000    
Comparable company revenue volatility   12.70%            
Discount rate   5.40%            
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Level 3 [Member]                
Business Acquisition [Line Items]                
Estimated fair value of contingent consideration       $ 0   $ 12,000,000    
ReproSource, Inc. [Member]                
Business Acquisition [Line Items]                
Contingent consideration arrangements, range of outcomes, value, high         $ 10,000,000      
Comparable company revenue volatility 8.50%              
Discount rate 6.50%              
ReproSource, Inc. [Member] | Level 3 [Member]                
Business Acquisition [Line Items]                
Estimated fair value of contingent consideration         $ 5,000,000