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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Apr. 30, 2020
Concentration Risk [Line Items]            
CARES Act grant           $ 11,700
Investments in equity-method investees $ 16,600   $ 16,600   $ 17,000  
Proportionate share of earnings in equity-method investees 800 $ 800 2,364 $ 2,018    
Capital distribution received from investment $ 2,300 $ 500 $ 2,800 $ 500    
Revenue from Contract with Customer Benchmark | Company's Largest Payer            
Concentration Risk [Line Items]            
Concentration risk 16.00% 15.00% 15.00% 13.00%    
Contract term     2 years      
Revenue from Contract with Customer Benchmark | Governmental Programs            
Concentration Risk [Line Items]            
Concentration risk 16.00% 13.00% 14.00% 12.00%    
Accounts Receivable | Governmental Programs            
Concentration Risk [Line Items]            
Concentration risk 13.00%       12.00%  
Cost of Goods and Service, Product and Service Benchmark | Medical Supply Vendors            
Concentration Risk [Line Items]            
Concentration risk 71.00% 69.00% 72.00% 72.00%