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Fair Value Information and Derivative Financial Instruments (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair value information and derivative financial instruments (Textual) [Abstract]      
Total derivative ineffectiveness expense $ 0 $ 0 $ 600,000
Cost of sales [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized gain or loss on undesignated forward contracts   $ 1,200,000