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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for doubtful accounts, Beginning balance |  |  | $ (2,674) |
less allowance for doubtful accounts | $ (422) | $ (262) | (1,025) | $ (723)
Allowances for doubtful accounts | (2,049) | (1,046) | (5,176) | (3,162)
Total charges |  |  | (1,025) |
Allowance for doubtful accounts, Ending balance | (3,699) |  | (3,699) |
Medicaid [Member] |  |  |  |
less allowance for doubtful accounts | (15) | (10) | (40) | (22)
Allowances for doubtful accounts | (15) | (10) | (40) | (22)
Medicare [Member] |  |  |  |
less allowance for doubtful accounts | (121) | (56) | (296) | (183)
Allowances for doubtful accounts | (811) | (373) | (1,979) | (1,217)
Third Party Payer [Member] |  |  |  |
less allowance for doubtful accounts | (286) | (196) | (689) | (518)
Allowances for doubtful accounts | $ (950) | $ (490) | $ (2,313) | $ (1,297)

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