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ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract] |  |  |  |
Balance, beginning of year | $ 5,402 | $ 5,579 | $ 5,452 | $ 5,592
Provision for credit losses | 445 |  | 607 |
Uncollectible receivables written-off | (107) | (82) | (285) | (97)
Effect of foreign currency | 55 | (2) | 21 |
Balance, end of year | $ 5,795 | $ 5,495 | $ 5,795 | $ 5,495

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