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Financial Instruments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Forward_Contracts
Dec. 31, 2012
Forward_Contracts
Mar. 31, 2013
Minimum [Member]
Apr. 01, 2012
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Apr. 01, 2012
Maximum [Member]
Derivative [Line Items]            
Number of forward contracts 13 12        
Fair value liability of derivative forward contracts $ (500,000)          
Fair value asset of derivative forward contracts   500,000        
Foreign Currency Transaction Gain (Loss), Unrealized     $ 0 $ 0 $ 1,000,000 $ 500,000