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Derivative Financial Instruments (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Foreign currency exchange forwards
Jun. 30, 2013
Foreign currency exchange forwards
Jun. 30, 2014
Foreign currency exchange forwards
Jun. 30, 2013
Foreign currency exchange forwards
Jun. 30, 2014
Foreign currency collar
Jun. 30, 2014
Foreign currency collar
Dec. 31, 2013
Not Designated as Hedges
Dec. 31, 2013
Not Designated as Hedges
Foreign currency exchange forwards
Dec. 31, 2013
Not Designated as Hedges
Foreign currency collar
Derivative financial instruments                          
Realized gain                 $ 400,000        
Outstanding derivative instruments 0   0                    
Fair value of derivative assets                     907,000 1,000 906,000
Notional amount of derivative instruments                     38,769,000 4,700,000 34,069,000
Amount of realized net gain (loss) and changes in the fair value of derivatives         6,000 (71,000) (89,000) 157,000 (124,000) (457,000)      
Weighted average notional amount of derivatives outstanding $ 10,457,000 $ 1,360,000 $ 11,201,000 $ 1,994,000