Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Stock Options (Details)

v2.4.0.6
Stock Options (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Number of Options Outstanding, Shares under option 3,315,917    
Weighted Average Exercise Price, Shares under option $ 18.59 $ 15.16 $ 14.08
Weighted Average Exercise Price, Granted $ 46.87 $ 25.42 $ 18.50
Weighted Average Exercise Price, Objet options from merger $ 6.10    
Weighted Average Exercise Price, Exercised $ 11.50 $ 14.61 $ 13.97
Weighted Average Exercise Price, Expired   $ 12.49  
Weighted Average Exercise Price, Forfeited $ 31.05 $ 16.08 $ 14.68
Weighted Average Exercise Price, Repurchased     $ 14.04
Weighted Average Exercise Price, Shares under option $ 11.84 $ 18.59 $ 15.16
Common Stock [Member]
      
Number of Options Outstanding, Shares under option 1,037,267 1,182,650 1,519,628
Number of Options Outstanding, Granted 336,750 325,000 305,000
Number of Options Outstanding, Objet options from merger 3,286,909    
Number of Options Outstanding, Exercised (1,322,047) (423,783) (456,200)
Number of Options Outstanding, Expired   (3,000)  
Number of Options Outstanding, Forfeited (22,962) (43,600) (46,900)
Number of Options Outstanding, Repurchased     (138,878)
Number of Options Outstanding, Shares under option 3,315,917 1,037,267 1,182,650
Minimum [Member]
      
Per Share Exercise Price, Shares under option $ 9.30 $ 8.27 $ 8.27
Per Share Exercise Price, Granted $ 46.87 $ 21.08 $ 18.26
Per Share Exercise Price, Objet options from merger $ 2.21    
Per Share Exercise Price, Exercised $ 2.21 $ 8.27 $ 9.30
Per Share Exercise Price, Expired   $ 12.49  
Per Share Exercise Price, Forfeited $ 9.30 $ 9.30 $ 9.30
Per Share Exercise Price, Repurchased     $ 9.30
Per Share Exercise Price, Shares under option $ 2.21 $ 9.30 $ 8.27
Maximum [Member]
      
Per Share Exercise Price, Shares under option $ 33.06 $ 33.06 $ 26.15
Per Share Exercise Price, Granted $ 46.87 $ 25.95 $ 33.06
Per Share Exercise Price, Objet options from merger $ 15.64    
Per Share Exercise Price, Exercised $ 33.06 $ 24.65 $ 26.15
Per Share Exercise Price, Expired   $ 12.49  
Per Share Exercise Price, Forfeited $ 46.87 $ 25.50 $ 23.04
Per Share Exercise Price, Repurchased     $ 26.15
Per Share Exercise Price, Shares under option $ 46.87 $ 33.06 $ 33.06