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EQUITY-METHOD INVESTMENTS - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2005
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of equity method investments | investment 2        
Investments in equity-method investees $ 17,000 $ 14,600      
Proportionate share of earnings in equity-method investees 2,840 1,020 $ 2,186    
Capital distribution from equity method investments 500 2,000 1,250    
Legacy Health Systems          
Schedule of Equity Method Investments [Line Items]          
Proportionate share of earnings in equity-method investees $ 993 886 1,639    
Ownership interest 50.00%        
Initial investment         $ 1,300
Capital distribution from equity method investments $ 500 2,000 1,300    
Vanderbilt Health Services          
Schedule of Equity Method Investments [Line Items]          
Proportionate share of earnings in equity-method investees $ 1,847 $ 134 $ 547    
Ownership interest 50.00%        
Initial investment       $ 1,100