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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2013
Derivative Instruments and Hedging Activities  
Fair value of derivative instruments

 

 

 
   Asset Derivatives  
 
   December 31,  
 
   2012   2013  
Derivatives Not Designated as
Hedging Instruments
  Balance Sheet
Location		   Fair
Value		   Balance Sheet
Location		   Fair
Value		  

Foreign exchange contracts

   Prepaid expenses and other   $ —   Prepaid expenses and other   $ 72  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

       $ —       $ 72  
                   
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   Liability Derivatives  
 
   December 31,  
 
   2012   2013  
Derivatives Not Designated as Hedging Instruments
  Balance Sheet
Location		   Fair
Value		   Balance Sheet
Location		   Fair
Value		  

Foreign exchange contracts

   Accrued expenses   $ 1,522   Accrued expenses   $ 5,592  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

       $ 1,522       $ 5,592  
                   
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Fair value of derivative instruments, amount of (gain) loss recognized in income


 

 
    
   Amount of (Gain) Loss
Recognized in Income
on Derivatives		  
 
    
   December 31,  
 
   Location of (Gain) Loss
Recognized in Income on
Derivative		  
Derivatives Not Designated as Hedging Instruments
  2011   2012   2013  

Foreign exchange contracts

   Other (income) expense, net   $ (1,209 ) $ 13,007   $ (2,955 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

       $ (1,209 ) $ 13,007   $ (2,955 )
                   
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