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Foreign Exchange Contracts and Transaction Gains/Losses (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreign Exchange Contracts and Transaction Gains/Losses [Abstract]      
Foreign exchange contracts outstanding $ 0 $ 0  
Foreign currency transaction exchange gains (losses) $ (445,000) $ (100,000) $ 614,000