Derivative Financial Instruments, Gain (Loss) recognized in income (Details) (Not Designated as Hedging Instrument [Member], Foreign Exchange Contract [Member], Cost of Sales [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) of derivative financial instruments recognized in income, net	$ 418	$ (530)