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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
(Loss) gain recognized on non-designated derivative instruments
The following table summarizes the (loss) gain recognized on non-designated foreign-exchange derivative instruments for the three and six months ended June 30:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,

 
2014
 
2013
 
2014
 
2013
Interest expense
 
$
(1,538
)
 
$
(1,812
)
 
$
(2,969
)
 
$
(2,627
)
Foreign exchange gain (loss), net
 
360

 
9,553

 
1,591

 
10,955

 
 
$
(1,178
)
 
$
7,741

 
$
(1,378
)
 
$
8,328