FINANCIAL INSTRUMENTS - Gain (Loss) by Hedging Relationship (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative designated as hedging instrument [Member]
Effect of derivative instruments on statements of operations [Abstract]
Net gain (loss) recognized in OCI, net of tax	$ 1,867	$ (796)	$ (794)
Net gain reclassified from accumulated OCI into Revenue	1,303	800	1,226
Net gain reclassified from accumulated OCI into Other income (expense), net	55	158	0
Net gain recognized in Other income (expense), net	11	74	109
Derivative not designated as hedging instrument [Member]
Effect of derivative instruments on statements of operations [Abstract]
Net gain (loss) recognized in Other income (expense), net	$ 59	$ (122)	$ (539)