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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain (loss) recognized on non-designated derivative instruments
The following table summarizes the gain (loss) recognized on non-designated foreign-exchange derivative instruments for the three and nine months ended September 30:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,

 
2014
 
2013
 
2014
 
2013
Interest expense
 
$
(1,415
)
 
$
(2,099
)
 
$
(4,384
)
 
$
(4,726
)
Foreign exchange gain (loss), net
 
9,180

 
(680
)
 
10,706

 
10,275

 
 
$
7,765

 
$
(2,779
)
 
$
6,322

 
$
5,549