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EQUITY-METHOD INVESTMENTS - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
investment
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
investment
Jun. 30, 2019
USD ($)
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   2        
Investments in equity-method investees $ 18,000,000.0   $ 18,000,000.0   $ 17,000,000.0    
Proportionate share of earnings in equity-method investees $ 1,000,000.0 $ 600,000 $ 1,574,000 $ 1,192,000      
Legacy Health Systems              
Schedule of Equity Method Investments [Line Items]              
Ownership interest 50.00%   50.00%        
Initial investment             $ 1,300,000
Capital distribution received from investment $ 0 $ 0 $ 500,000 $ 0      
Vanderbilt Health Services              
Schedule of Equity Method Investments [Line Items]              
Ownership interest 50.00%   50.00%        
Initial investment           $ 1,100,000