COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in accumulated other comprehensive income (loss) by component
Balance	$ 211,660	$ 319,795	$ 95,774
Balance	290,105	211,660	319,795
Unrealized Gain (Loss) on Marketable Securities, net of tax
Changes in accumulated other comprehensive income (loss) by component
Balance	9	82	156
Other comprehensive (loss) income before reclassifications	(298)	(73)	(74)
Net current-period other comprehensive income	(298)	(73)	(74)
Balance	(289)	9	82
Foreign Currency Items
Changes in accumulated other comprehensive income (loss) by component
Balance	2,581	2,586	2,589
Other comprehensive (loss) income before reclassifications	15	(5)	(3)
Net current-period other comprehensive income	15	(5)	(3)
Balance	2,596	2,581	2,586
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss) by component
Balance	2,590	2,668	2,745
Other comprehensive (loss) income before reclassifications	(283)	(78)	(77)
Net current-period other comprehensive income	(283)	(78)	(77)
Balance	$ 2,307	$ 2,590	$ 2,668