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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Concentration Risk [Line Items]              
Operating lease liabilities $ 83,964   $ 83,964   $ 83,964   $ 67,000
Operating lease right-of-use asset $ 68,042 $ 0 $ 68,042   $ 68,042   $ 59,900
Revenue from Contract with Customer Benchmark | Company's Largest Payer              
Concentration Risk [Line Items]              
Concentration risk     15.00% 16.00% 13.00% 14.00%  
Revenue from Contract with Customer Benchmark | Governmental Programs              
Concentration Risk [Line Items]              
Concentration risk     13.00% 11.00% 12.00% 11.00%  
Accounts Receivable | Governmental Programs              
Concentration Risk [Line Items]              
Concentration risk 14.00% 13.00%          
Cost of Goods and Service, Product and Service Benchmark | Medical Supply Vendors              
Concentration Risk [Line Items]              
Concentration risk     69.00% 75.00% 72.00% 76.00%  
Overstatement Of Prior Period Goodwill              
Concentration Risk [Line Items]              
Amount of misstatement being corrected     $ (6,500)        
Overstatement Of Prior Period Noncurrent Liabilities, Other              
Concentration Risk [Line Items]              
Amount of misstatement being corrected     $ 6,500