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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts, Beginning balance $ (2,674)  
less allowance for doubtful accounts (1,339) $ (968)
Allowances for doubtful accounts (7,431) (4,095)
Total charges (1,339)  
Allowance for doubtful accounts, Ending balance (4,013) (2,674)
Medicaid [Member]    
less allowance for doubtful accounts (53) (28)
Allowances for doubtful accounts (53) (28)
Medicare [Member]    
less allowance for doubtful accounts (387) (251)
Allowances for doubtful accounts (2,882) (1,669)
Third Party Payer [Member]    
less allowance for doubtful accounts (899) (689)
Allowances for doubtful accounts $ (3,442) $ (1,725)