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Foreign Exchange Transaction Gains/Losses (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Foreign Exchange Transaction Gains/Losses [Abstract]        
Foreign exchange transaction exchange gains (losses) $ 30,000 $ 158,000 $ 210,000 $ 175,000