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Derivative Financial Instruments (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Foreign currency exchange forwards
      
Derivative financial instruments      
Amount of realized net gain (loss) and changes in the fair value of derivatives $ 248,000 $ 333,000 $ 553,000
Weighted average notional amount of derivatives outstanding 5,200,000 3,500,000  
Foreign currency collar
      
Derivative financial instruments      
Amount of realized net gain (loss) and changes in the fair value of derivatives 906,000    
Not Designated as Hedges
      
Derivative financial instruments      
Fair value of derivative assets 907,000 248,000  
Notional amount of derivative instruments 38,769,000 9,590,000  
Not Designated as Hedges | Foreign currency exchange forwards
      
Derivative financial instruments      
Fair value of derivative assets 1,000 248,000  
Notional amount of derivative instruments 4,700,000 9,590,000  
Not Designated as Hedges | Foreign currency collar
      
Derivative financial instruments      
Fair value of derivative assets 906,000    
Notional amount of derivative instruments $ 34,069,000