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Financial Instruments and Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivatives designated as cash flow hedges:        
Amount of gain recorded in other comprehensive loss $ 2,988   $ 3,892  
Amount of gain recorded in other comprehensive income   560   680
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Loss 1,217   1,593  
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Income   24   24
Forward Contracts [Member]
       
Derivatives designated as cash flow hedges:        
Amount of gain recorded in other comprehensive loss 1,497   3,051  
Amount of gain recorded in other comprehensive income   0   0
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Loss 476   500  
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Income   0   0
Commodity Contract [Member]
       
Derivatives designated as cash flow hedges:        
Amount of gain recorded in other comprehensive loss 1,491   841  
Amount of gain recorded in other comprehensive income   560   680
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Loss 741   1,093  
Amount Of Loss Reclassified From Other Comprehensive Loss Into Net Income   $ 24   $ 24