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REVENUE AND ACCOUNTS RECEIVABLE - ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accounts Receivable [Abstract]    
Accounts receivable, gross $ 54,128 $ 54,842
Less: allowance for doubtful accounts (974) (902)
Accounts receivable, net 53,154 53,940
Medicare    
Accounts Receivable [Abstract]    
Accounts receivable, gross 30,384 31,327
Medicaid    
Accounts Receivable [Abstract]    
Accounts receivable, gross 10,225 11,793
Managed care    
Accounts Receivable [Abstract]    
Accounts receivable, gross 9,826 7,901
Private and other    
Accounts Receivable [Abstract]    
Accounts receivable, gross $ 3,693 $ 3,821