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ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract] |  |  |  |
Balance, beginning of year | $ 5,795 | $ 5,495 | $ 5,452 | $ 5,592
Provision for credit losses | 44 |  | 563 |
Uncollectible receivables written-off | (806) | (1,701) | (939) | (1,716)
Effect of foreign currency | 24 | (13) | (19) | (95)
Balance, end of year | $ 5,057 | $ 3,781 | $ 5,057 | $ 3,781

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