Supplemental Disclosures of Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Non-cash financing and investing activities [Abstract]
Unrealized gain on foreign currency exchange contracts	$ 1,021	$ 357
Unrealized gain (loss) on available-for-sale securities	$ (322)	$ 267