ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning of year	$ 5,592	$ 921	$ 662
Provision for doubtful accounts	1,711	3,679	458
Uncollectible receivables written-off	(1,311)	(429)	(180)
Effect of foreign currency	(540)	1,421	(19)
Balance, end of year	$ 5,452	$ 5,592	$ 921