ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning of year	$ 2,176	$ 3,425	$ 3,815
Provision for doubtful accounts	1,164	1,465	633
Uncollectible receivables written-off	(2,670)	(2,035)	(681)
Effect of foreign currency	(8)	(679)	(342)
Balance, end of year	$ 662	$ 2,176	$ 3,425