Financial Instruments (Details 9) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivatives in Foreign Currency Hedging relationships
Adjustments to accumulated other comprehensive income to record unrealized hedging gains	$ 49	$ (387)	$ 351	$ (179)
Realization of hedging gains (losses) upon settlement	466	(7)	724	542
Non Designated Derivatives in Foreign Currency relationships
Derivative gain (Loss)	93	(602)	721	(178)
Foreign Exchange Forward [Member] | Selling, general and administrative expenses [Member]
Non Designated Derivatives in Foreign Currency relationships
Derivative gain (Loss)	93	(602)	721	(178)
Fair Value Hedging [Member]
Derivatives in Foreign Currency Hedging relationships
Adjustments to accumulated other comprehensive income to record unrealized hedging gains	49	(387)	351	(179)
Realization of hedging gains (losses) upon settlement	466	(7)	724	542
Fair Value Hedging [Member] | Selling, general and administrative expenses [Member]
Derivatives in Foreign Currency Hedging relationships
Realization of hedging gains (losses) upon settlement	$ 466	$ (7)	$ 724	$ 542