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Foreign Currency Exchange Contracts and Hedging (Details) (Foreign currency exchange contracts, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Foreign currency exchange contracts and hedging    
Unrealized gain on outstanding foreign currency forward contracts $ 500  
Derivatives designated as cash flow hedges
   
Foreign currency exchange contracts and hedging    
Notional amounts of foreign currency hedging contracts subsequent to current period 63,000  
Summary of the effect of derivative instruments on the consolidated statements of income    
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (1,191) (1,376)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 617 125
Gain (Loss) from Amount Excluded from Effectiveness Testing 26 (260)
Non-designated derivatives
   
Foreign currency exchange contracts and hedging    
Notional amounts of foreign currency hedging contracts 19,000  
Summary of the effect of derivative instruments on the consolidated statements of income    
Amount of Gain (Loss) Recognized in Income on Derivatives $ 1,030 $ (541)