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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 03, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 09, 2016
Subsequent Event            
Common stock dividends, declared (in dollars per share)     $ 1.60 $ 1.51 $ 1.36  
Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member] | Scenario, Forecast [Member] | Forest Park Medical Center At Frisco, LLC [Member] | Financial Guarantee [Member]            
Subsequent Event            
Guarantees   $ 21,300        
Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member] | Scenario, Forecast [Member] | Minimum [Member]            
Subsequent Event            
Expected net proceeds in connect with sale   89,100        
Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member] | Scenario, Forecast [Member] | Minimum [Member] | Frisco Hospital and Debtor-In-Possession Loan [Member]            
Subsequent Event            
Expected loss on investments   30,000        
Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member] | Scenario, Forecast [Member] | Maximum [Member]            
Subsequent Event            
Expected net proceeds in connect with sale   94,100        
Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member] | Scenario, Forecast [Member] | Maximum [Member] | Frisco Hospital and Debtor-In-Possession Loan [Member]            
Subsequent Event            
Expected loss on investments   $ 35,000        
Subsequent Event [Member] | Discontinued Operations, Disposed of by Sale [Member] | Frisco Hospital [Member]            
Subsequent Event            
Disposal, total cash purchase price           $ 96,250
Less assumption of certain capital lease obligations           $ 7,300
Subsequent Event [Member] | Dividend Declared [Member]            
Subsequent Event            
Common stock dividends, declared (in dollars per share) $ 0.41          
Subsequent Event [Member] | Dividend Declared [Member] | Series A Preferred Stock [Member]            
Subsequent Event            
Preferred stock dividends, declared (in dollars per share) $ 0.4453125