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EQUITY-METHOD INVESTMENTS - Additional Information (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
investment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
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 $ 17,000,000   $ 17,000,000    
Proportionate share of earnings in equity-method investees 562,000 $ 549,000      
Legacy Health Systems          
Schedule of Equity Method Investments [Line Items]          
Proportionate share of earnings in equity-method investees $ 258,000 125,000      
Ownership interest 50.00%   50.00%    
Initial investment         $ 1,300,000
Capital distribution received from investment $ 500,000 0      
Vanderbilt Health Services          
Schedule of Equity Method Investments [Line Items]          
Proportionate share of earnings in equity-method investees $ 304,000 $ 424,000      
Ownership interest 50.00%        
Initial investment       $ 1,100,000