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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Allowance for doubtful accounts, Beginning balance     $ (4,013)  
Adjustment for allowance for doubtful accounts $ 100 $ (337) (187) $ (603)
Bad debt expense     (1)  
Write-offs     2,792  
Total charges     188  
Write-offs     188 606
Allowance for doubtful accounts, Ending balance (1,409)   (1,409)  
Medicaid [Member]        
Adjustment for allowance for doubtful accounts 10 (16) 1 (24)
Medicare [Member]        
Adjustment for allowance for doubtful accounts 110 (97) 11 (175)
Third Party Payers [Member]        
Adjustment for allowance for doubtful accounts $ (20) $ (224) $ (199) $ (404)