v3.3.1.900
Equity Option Award Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Option Activity [Abstract]  
Number of options, Outstanding at January 1, 2015 | shares 2,910,109
Number of options, Granted | shares 2,135,169
Number of options, Exercised | shares (364,211)
Number of options, Forfeited | shares (381,156)
Number of options, Expired | shares (38,321)
Number of options, Outstanding at December 31, 2015 | shares 4,261,590
Number of options, Vested or expected to vest at December 31, 2015 | shares 4,196,996
Number of options, Exercisable at December 31, 2015 | shares 1,701,182
Weighted-average exercise price, Outstanding at January 1, 2015 | $ / shares $ 40.19
Weighted-average exercise price, Granted | $ / shares 41.63
Weighted-average exercise price, Exercised | $ / shares 16.62
Weighted-average exercise price, Forfeited | $ / shares 60.74
Weighted-average exercise price, Expired | $ / shares 41.74
Weighted-average exercise price, Outstanding at December 31, 2015 | $ / shares 41.07
Weighted-average exercise price, Vested or expected to vest at December 31, 2015 | $ / shares 40.97
Weighted-average exercise price, Exercisable at December 31, 2015 | $ / shares $ 35.06
Weighted-Average Remaining Contractual Term, Outstanding at December 31, 2015 5 years 20 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest at December 31, 2015 5 years 15 days
Weighted-Average Remaining Contractual Term, Exercisable at December 31, 2015 3 years 4 months 25 days
Aggregate intrinsic value, Outstanding at December 31, 2015 | $ $ 1,916 [1]
Aggregate intrinsic value, Vested or expected to vest at December 31, 2015 | $ 1,916 [1]
Aggregate intrinsic value, Exercisable at December 31, 2015 | $ $ 1,916 [1]
[1] The aggregate intrinsic value is based upon the difference between the Company’s closing stock price at the date of the Consolidated Balance Sheet and the exercise price of the stock option for in-the-money stock options. The intrinsic value of outstanding stock options fluctuates based upon the trading value of the Company’s Common stock.