ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning of year	$ 662	$ 2,176	$ 3,425
Provision for doubtful accounts	458	1,164	1,465
Uncollectible receivables written-off	(180)	(2,670)	(2,035)
Effect of foreign currency	(19)	(8)	(679)
Balance, end of year	$ 921	$ 662	$ 2,176