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Derivative Instruments, Hedging Activities and Fair Value (Details 5) (Fair value measurements recurring, Level 2, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair value measurements recurring | Level 2
   
Assets    
Foreign currency forward exchange contracts $ 789 $ 853
Cross-currency interest rate swaps 31,967 39,058
Liabilities    
Foreign currency forward exchange contracts 3,019 1,775
Cross-currency interest rate swaps $ 12,378 $ 14,346