Supplemental Disclosures of Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Non-cash financing and investing activities [Abstract]
Unrealized income (loss) on foreign currency exchange contracts	$ 1,345	$ (329)
Unrealized gain (loss) on available-for-sale securities	$ (267)	$ 265