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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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- Definition

Impact of foreign currency related to the rollforward of allowance for doubtful accounts between periods.

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Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of direct write-downs of accounts receivable charged against the allowance.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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