Derivative Instruments - Effect on Income Statement (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Attributable To Foreign Exchange Rate Fluctuations, Inclusive Of The Impact Of Derivatives	$ (2,222)	$ (1,185)	$ (3,553)
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in OCI (effective portion)	108	(1,278)	(765)
Foreign Exchange Contract [Member] | Cost of Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified from accumulated OCI into cost of sales (effective portion)	3,558	(1,939)	426
Foreign Exchange Contract [Member] | Other Income Expense Net [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other, net	(6,181)	(2,482)	(1,667)
Foreign Exchange Contract [Member] | Other Income Expense Net [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other, net (ineffective portion and amount excluded from effectiveness testing)	$ 83	$ (117)	$ (1,270)