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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allowance for doubtful accounts, Beginning balance     $ (4,013)  
Adjustment for allowance for doubtful accounts $ 107 $ (422) (80) $ (1,025)
Bad debt expense     (2)  
Write-offs     2,792  
Total charges     82  
Write-offs     82 1,025
Allowance for doubtful accounts, Ending balance (1,303)   (1,303)  
Medicaid [Member]        
Adjustment for allowance for doubtful accounts (3) (15) (2) (40)
Medicare [Member]        
Adjustment for allowance for doubtful accounts (47) (121) (36) (296)
Third Party Payers [Member]        
Adjustment for allowance for doubtful accounts $ 157 $ (286) $ (42) $ (689)