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Financial Instruments and Fair Value Measurements (Schedule of Cash Flow Hedges in Other Comprehensive Loss and Net Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivatives designated as cash flow hedges:        
Gain (loss) recorded in other comprehensive loss $ 552 $ 3,190 $ (871) $ 7,083
Gain(loss) reclassified from other comprehensive income into net income 243 (789) 1,498 (2,381)
Forward Contracts [Member]
       
Derivatives designated as cash flow hedges:        
Gain (loss) recorded in other comprehensive loss (83) 2,301 228 5,352
Gain(loss) reclassified from other comprehensive income into net income 612 (15) 2,150 (515)
Commodity Contract [Member]
       
Derivatives designated as cash flow hedges:        
Gain (loss) recorded in other comprehensive loss 635 889 (1,099) 1,731
Gain(loss) reclassified from other comprehensive income into net income $ (369) $ (774) $ (652) $ (1,866)