ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning of year	$ 921	$ 662	$ 2,176
Provision for doubtful accounts	3,679	458	1,164
Uncollectible receivables written-off	(429)	(180)	(2,670)
Effect of foreign currency	(26)	(19)	(8)
Balance, end of year	$ 4,145	$ 921	$ 662