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Derivative instruments used in hedging activities (Details 1) (Foreign exchange contract [Member], Fair value hedge [Member], Foreign Currency Gain (Loss) [Member], USD $) In Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Foreign exchange contract [Member] \| Fair value hedge [Member] \| Foreign Currency Gain (Loss) [Member]
Derivatives designated as fair value hedges and related hedged item
Amount of gain (loss) recognized in income on derivative	$ 897	$ (2,925)
Amount of gain (loss) on hedged item recognized in income attributable to risk being hedged	(897)	2,925
Amount of gain (loss) recognized in income on derivative (ineffective portion)	$ 0	$ 0

Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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