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Hedging Activities and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Hedging Activities and Fair Value Measurements  
Schedule of Notional Amounts, Fair Values and Classification of the Company's Outstanding Derivatives by Risk Category and Instrument Type
Schedule of Gains and Losses on Derivatives Designated as Cash Flow Hedges
Schedule of Gains and (Losses) on Forward Currency Contracts Outstanding and Total Net Foreign Currency Gains and (Losses)
Schedule of Gains and (Losses), Net of Income Tax, Associated With Changes in the Fair Value of Debt
     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
     2011     2010      2011     2010  

(Loss) gain, net of income tax, recorded through other comprehensive income

   $ (317 )    $ 1,566       $ (317 )    $ 2,637   

Balance included in accumulated other comprehensive income at June 30

          (5,450 )      (2,809 ) 
Summary of Fair Value Hierarchy of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis