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ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract] |  |  |  |
Balance, beginning of year | $ 4,997 | $ 5,402 | $ 5,067 | $ 5,452
Provision for credit losses | 135 | 445 | 155 | 607
Uncollectible receivables written-off | (178) | (107) | (261) | (285)
Effect of foreign currency | (2) | 55 | (9) | 21
Acquisition credit losses | 988 |  | 988 |
Balance, end of year | $ 5,940 | $ 5,795 | $ 5,940 | $ 5,795

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