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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain (loss) recognized on non-designated derivative instruments
The following table summarizes the (loss) gain recognized on non-designated foreign-exchange derivative instruments:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,

 
2013
 
2012
 
2013
 
2012
Interest expense
 
$
(2,099
)
 
$
(1,121
)
 
$
(4,726
)
 
$
(3,787
)
Foreign exchange (loss) gain, net
 
(680
)
 
(3,108
)
 
10,275

 
(2,509
)
 
 
$
(2,779
)
 
$
(4,229
)
 
$
5,549

 
$
(6,296
)