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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2015
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy

As of December 31, 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), as of:

 

          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 during 2015, 2014, and 2013 were as follows (in thousands):

 

          Years Ended December 31,  
    

Location

   2015      2014      2013  

Non-hedging derivative instruments:

           

Unrealized (loss) gain on foreign currency forward contracts

   Other income (expense), net    $ (1,641    $ 1,682       $ (41

Realized gain (loss) on foreign currency forward contracts

   Other income (expense), net    $ 2,129       $ (562    $ (629