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REVENUE AND ACCOUNTS RECEIVABLE - ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts Receivable [Abstract]    
Accounts receivable, gross $ 54,335 $ 47,864
Less: allowance for doubtful accounts (933) (643)
Accounts receivable, net 53,402 47,221
Medicare    
Accounts Receivable [Abstract]    
Accounts receivable, gross 30,127 28,569
Medicaid    
Accounts Receivable [Abstract]    
Accounts receivable, gross 9,655 7,669
Managed care    
Accounts Receivable [Abstract]    
Accounts receivable, gross 9,754 7,590
Private and other    
Accounts Receivable [Abstract]    
Accounts receivable, gross $ 4,799 $ 4,036