Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Equity (Summary of RSUs activity) (Details)

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Equity (Summary of RSUs activity) (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Number of RSUs  
RSUs outstanding as of January 1, 2015 667,498
Granted 80,685
Forfeited (65,261)
RSUs outstanding as of June 30, 2015 682,922
Weighted Average Grant Date Fair Value  
RSUs outstanding as of January 1, 2015 $ 94.19
Granted 66.50
Forfeited 92.50
RSUs outstanding as of June 30, 2015 $ 91.08