Derivative Financial Instruments, Gain (Loss) recognized in income (Details) (Not Designated as Hedging Instrument [Member], Foreign Exchange Contract [Member], Cost of Sales [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
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	$ 77,000	$ 361,000	$ 401,000	$ 891,000