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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2015
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy

As of June 30, 2015, there were no financial assets or liabilities measured at fair value on a recurring basis. As of December 31, 2014, financial assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, consisted of the following (in thousands):

 

         December 31, 2014  
         Fair Value Measurements
Using Input Types
 
   

Line Item

   Level 1      Level 2      Level 3      Total  

Non-hedging derivative assets:

             

Foreign currency forward contracts

  Prepaid expenses and other current assets    $ 0       $ 1,647       $ 0       $ 1,647   

Non-hedging derivative liabilities:

             

Foreign currency forward contracts

  Accounts payable and accrued expenses    $ 0       $ 6       $ 0       $ 6   
Changes in Fair Value of Foreign Currency Forward Contracts

Changes in the fair value of our foreign currency forward contracts (in thousands) for the three and six months ended June 30, 2015 and 2014 were as follows:

 

   

Gain (Loss) on Derivative Instruments Recognized in Income

 
         Three Months Ended     Six Months Ended  
         June 30,     June 30,  
   

Location

   2015     2014     2015     2014  

Non-hedging derivative instruments:

          

Unrealized loss on foreign currency forward contracts

  Other income (expense), net    $ (2,590   $ (46   $ (1,641   $ (86

Realized gain (loss) on foreign currency forward contracts

  Other income (expense), net    $ 2,129      $ (307   $ 2,129      $ (562