Derivative Financial Instruments, Gain (Loss) recognized in income (Details) (Foreign Exchange Contract [Member], Cost of Sales [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Foreign Exchange Contract [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) of derivative financial instruments recognized in income, net	$ (496,000)	$ (106,000)	$ 780,000	$ (507,000)