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Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Foreign currency exchange forwards
Sep. 30, 2012
Foreign currency exchange forwards
Sep. 30, 2013
Foreign currency exchange forwards
Sep. 30, 2012
Foreign currency exchange forwards
Sep. 30, 2013
Not Designated as Hedges
Dec. 31, 2012
Not Designated as Hedges
Sep. 30, 2013
Not Designated as Hedges
Foreign currency exchange forwards
Dec. 31, 2012
Not Designated as Hedges
Foreign currency exchange forwards
Derivative financial instruments                
Notional amount of derivative instruments         $ 1,840 $ 9,590 $ 1,840 $ 9,590
Estimated fair value of derivative liability         9   9  
Estimated fair value of derivative assets           244   244
Amount of Realized and Unrealized Net Gain and Changes in the Fair value of Forward Contracts (11) (12) 146 (90)        
Weighted average notional amount of derivatives outstanding $ 1,148 $ 2,188 $ 1,712 $ 2,350