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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Allowance of Credit Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Total allowance for credit losses - January 1 | $ 1,867 | $ 1,415 | $ 1,292
Current-period provision for expected credit losses | 1,894 | 866 | 504
Write-offs | (934) | (3) | (11)
Recoveries collected | (518) | (411) | (370)
Total allowance for credit losses - December 31 | $ 2,309 | $ 1,867 | $ 1,415

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