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Equity Incentive Plans and Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2011
Equity Incentive Plans and Stock-Based Compensation |
Shares available for grant under stock-based incentive plans |
|  | Shares Available for Grant |
Shares available as of December 31, 2010 |  | 5,348,162 |
Stock options granted |  | (1,712,211 | )
Stock options forfeited |  | 447,417 |
Stock options expired under former plans |  | (262,716 | )
Nonvested equity stock and stock units granted (1) |  | (320,331 | )
Nonvested equity stock and stock units forfeited (1) |  | 22,401 |
Total available for grant as of June 30, 2011 |  | 3,522,722 |
(1) For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.
Schedule of stock option activity |
|  | Options Outstanding |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |
|  |  |  | Average |  | Remaining |  | Aggregate |
|  | Number of |  | Exercise Price |  | Contractual |  | Intrinsic |
|  | Shares |  | Per Share |  | Term(in years) |  | Value |
|  | (Dollars in thousands, except per share amounts) |
Outstanding as of December 31, 2010 |  | 13,969,383 |  | $ | 18.85 |  |  |  |  |
Options granted |  | 1,712,211 |  | 20.71 |  |  |  |  |
Options exercised |  | (478,974 | ) | 10.29 |  |  |  |  |
Options forfeited |  | (447,417 | ) | 11.48 |  |  |  |  |
Outstanding as of June 30, 2011 |  | 14,755,203 |  | 19.57 |  | 5.61 |  | $ | 14,793 |
Vested or expected to vest at June 30, 2011 |  | 14,209,999 |  | 19.56 |  | 5.49 |  | 14,406 |
Options exercisable at June 30, 2011 |  | 10,199,075 |  | 19.76 |  | 4.36 |  | 10,787
Weighted-average assumptions for Stock Option Plans |
|  | Stock Option Plans |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2011 |  | 2010 |  | 2011 |  | 2010 |
Stock Option Plans |  |  |  |  |  |  |  |  |
Expected stock price volatility |  | 50 | % | 69 | % | 50-52% |  | 61-69% |
Risk free interest rate |  | 2.6 | % | 3.2 | % | 2.6-2.8% |  | 2.4-3.2% |
Expected term (in years) |  | 6.1 |  | 6.1 |  | 6.0 - 6.1 |  | 5.9 – 6.1 |
Weighted-average fair value of stock options granted |  | $ | 8.58 |  | $ | 14.38 |  | $ | 10.71 |  | $ | 13.27
Weighted-average assumptions for Employee Stock Purchase Plan |
|  | Employee Stock Purchase Plan |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2011 |  | 2010 |  | 2011 |  | 2010 |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Expected stock price volatility |  | 56 | % | 54 | % | 56 | % | 54 | %
Risk free interest rate |  | 0.1 | % | 0.3 | % | 0.1 | % | 0.3 | %
Expected term (in years) |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5 |
Weighted-average fair value of purchase rights granted under the purchase plan |  | $ | 5.96 |  | $ | 7.46 |  | $ | 5.96 |  | $ | 7.46 |
Activity related to nonvested equity stock and stock units |
Nonvested Equity Stock and Stock Units |  | Shares |  | Weighted- Average Grant-Date Fair Value |
Nonvested at December 31, 2010 |  | 718,007 |  | $ | 18.23 |
Granted |  | 213,554 |  | 20.86 |
Vested |  | (147,197 | ) | 17.30 |
Forfeited |  | (14,934 | ) | 21.76 |
Nonvested at June 30, 2011 |  | 769,430 |  | 19.07 |

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