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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allowance for doubtful accounts, Beginning balance $ (4,013)  
less allowance for doubtful accounts (287) $ (266)
Bad debt expense (1)  
Total charges (288)  
Allowance for doubtful accounts, Ending balance (4,301)  
Medicaid [Member]    
less allowance for doubtful accounts (8) (8)
Medicare [Member]    
less allowance for doubtful accounts (99) (79)
Third Party Payers [Member]    
less allowance for doubtful accounts $ (180) $ (179)