A summary of the status of our outstanding stock options is presented in the tables below:
| Shares | Weighted Average Exercise Price |
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|
Outstanding at December 31, 2010 |
6,636,480 | $ | 7.55 | |||||
|
Exercised |
(1,822,373 | ) | 3.92 | |||||
|
Granted |
16,974 | 26.50 | ||||||
|
Forfeited |
(18,853 | ) | 13.29 | |||||
|
Expired |
(19,819 | ) | 14.50 | |||||
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|
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|
Outstanding at December 31, 2011 |
4,792,409 | $ | 8.95 | |||||
|
Exercised |
(1,930,092 | ) | 10.31 | |||||
|
Forfeited |
(33,381 | ) | 10.73 | |||||
|
Expired |
(17,997 | ) | 14.36 | |||||
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|
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|
Outstanding at December 31, 2012 |
2,810,939 | $ | 7.93 | |||||
|
Exercised |
(1,620,515 | ) | 3.45 | |||||
|
Forfeited |
(2,009 | ) | 13.85 | |||||
|
Expired |
(39,666 | ) | 23.08 | |||||
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|
Outstanding at December 31, 2013 |
1,148,749 | $ | 13.60 | |||||
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|
Vested and expected to vest at December 31, 2013 (1) |
1,148,604 | $ | 13.60 | |||||
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|
Exercisable at December 31, 2013 |
1,146,229 | $ | 13.57 | |||||
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| (1) | The expected to vest options are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options. |