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Foreign Exchange Transaction Losses (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Foreign Exchange Transaction Losses [Abstract]        
Foreign exchange transaction exchange gains (losses) $ 114,000 $ 180,000 $ 55,000 $ 50,000