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Equity (Tables)
9 Months Ended
Sep. 30, 2015
Schedule of Share-based Compensation Expense
  Three Months Ended
Nine Months Ended
  September 30,   September 30,
  2015   2014
2015   2014
  U.S. $ in thousands
Cost of sales   $ 739
  $  1,282
$ 4,369 $ 3,228
Research and development, net     985
     1,098

4,359 2,921
Selling, general and administrative     3,112
     5,217

15,432 15,262
Total stock-based compensation expenses   $ 4,836
  $  7,597
$ 24,160
$ 21,411
Summary of Stock Options Activity
  Weighted Average
Number of Options   Exercise Price
Options outstanding as of January 1, 2015 1,719,241   $ 43.89
Granted 736,474     35.58
Exercised   (125,193 ) 18.79
Forfeited (69,192 )   72.20
Options outstanding as of September 30, 2015   2,261,330
$ 41.71
Options exercisable as of September 30, 2015 1,039,934   $ 31.00
Summary of RSUs activity
  Weighted Average
  Number of RSUs   Grant Date Fair Value
Unvested RSUs outstanding as of January 1, 2015   667,498   $ 94.19
Granted   158,861  
48.13
Forfeited  

(123,858

)
92.11
Vested  

  (84,818

  97.37
Unvested RSUs outstanding as of September 30, 2015   617,683 $ 83.95
Schedule of Accumulated other comprehensive loss
 Nine months ended September 30, 2015  
 Net unrealized gain    Foreign currency        
 (loss) on cash flow    translation        
 hedges    adjustments             Total            
 U.S. $ in thousands  
Balance as of January 1, 2015   $

(1,243

)   $ (2,404 )   $ (3,647 )
Other comprehensive loss before                      
reclassifications   (411 )     (6,216 )     (6,627 )
Amounts reclassified from accumulated                        
other comprehensive loss     1,575       -       1,575  
Other comprehensive income (loss)
  1,164       (6,216 )     (5,052 )
Balance as of September 30, 2015   (79 )   $ (8,620 )   (8,699 )

 

  Nine months ended September 30, 2014  
 Net unrealized gain    Foreign currency                
 (loss) on cash flow   translation                
 hedges   adjustments           Other                     Total          
                 U.S. $ in thousands  
Balance as of January 1, 2014   153     $ 1,922     $ (167 )   $ 1,908  
Other comprehensive loss before                              
reclassifications   (1,037 )     (2,325 )     -       (3,362 )
Amounts reclassified from accumulated                                
other comprehensive income (loss)     (68 )     -
    167       99
Other comprehensive income (loss)   (1,105 )     (2,325 )     167       (3,263 )
Balance as of September 30, 2014   $
(952   $ (403   $ -     $ (1,355