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

Equity (Summary of RSUs activity) (Details)

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Equity (Summary of RSUs activity) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of RSUs  
Unvested RSUs outstanding as of December 31, 2014 | shares 660,101
Granted | shares 158,935
Vested | shares (93,424)
Forfeited | shares (166,488)
Unvested RSUs outstanding as of December 31, 2015 | shares 559,124
Weighted Average Grant Date Fair Value  
Unvested RSUs outstanding as of December 31, 2014 | $ / shares $ 94.15
Granted | $ / shares 48.10
Vested | $ / shares 97.71
Forfeited | $ / shares 91.17
Unvested RSUs outstanding as of December 31, 2015 | $ / shares $ 81.35