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Summary of Gain/Loss on Derivative Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Financial Instruments [Abstract]        
Foreign currency transaction losses, net $ 1,043,000 $ 21,000 $ 4,457,000 $ 2,670,000
Gain/loss associated with foreign currency exchange forwards 2,588,000 2,793,000 (8,064,000) 4,977,000
Foreign currency transaction gains/losses, gross $ 1,600,000 $ 2,800,000 $ 12,600,000 $ 2,300,000