FINANCIAL INSTRUMENTS - Gain (Loss) by Hedging Relationship (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative designated as hedging instrument [Member]
Effect of derivative instruments on statements of operations [Abstract]
Net (loss) gain recognized in OCI, net of tax	$ (1,027)	$ 1,867	$ (796)
Net gain reclassified from accumulated OCI into Revenue	3,701	1,303	800
Net gain reclassified from accumulated OCI into Other income, net	0	55	158
Net gain recognized in Other income, net	130	11	74
Derivative not designated as hedging instrument [Member]
Effect of derivative instruments on statements of operations [Abstract]
Net gain (loss) recognized in Other income, net	$ 0	$ 59	$ (122)