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Equity Incentive Plans and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Shares available for grant under stock-based incentive plans | A summary of shares available for grant under the Company’s plans is as follows:
| Shares Available for Grant
Shares available as of December 31, 2010 | 5,348,162
Stock options granted | (2,357,001)
Stock options forfeited | 865,097
Stock options expired under former plans | (503,526)
Nonvested equity stock and stock units granted (1) | (562,257)
Nonvested equity stock and stock units forfeited (1) | 22,401
Total shares available for grant as of December 31, 2011 | 2,812,876
Increase in shares approved for issuance | 6,500,000
Stock options granted (2) | (7,789,220)
Stock options forfeited (3) | 2,610,812
Stock options expired under former plans | (576,763)
Nonvested equity stock and stock units granted (1) | (1,113,014)
Nonvested equity stock and stock units forfeited (1) | 284,468
Total shares available for grant as of December 31, 2012 | 2,729,159
Stock options granted | (2,084,276)
Stock options forfeited | 3,318,022
Stock options expired under former plans | (1,157,419)
Nonvested equity stock and stock units granted (1) | (709,611)
Nonvested equity stock and stock units forfeited (1) | 431,553
Total shares available for grant as of December 31, 2013 | 2,527,428
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(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.
(2) | Amount includes 2,840,986 shares that were granted from the stock option exchange program (discussed below).
(3) | Amount excludes 6,449,255 shares that were surrendered from the stock option exchange program (discussed below) as the shares are no longer available for grant.
Schedule of stock option activity | The following table summarizes stock option activity under the 1997, 1999 and 2006 Plans for the years ended December 31, 2013, 2012 and 2011 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of December 31, 2013.
| Options Outstanding |  | Weighted Average Remaining Contractual Term |  |
| Number of Shares |  | Weighted Average Exercise Price per Share |  |  | Aggregate Intrinsic Value
| (Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2010 | 13,969,383 |  | $ | 18.85 |  |  |  |  |
Options granted | 2,357,001 |  | $ | 18.83 |  |  |  |  |
Options exercised | (873,691) |  | $ | 8.46 |  |  |  |  |
Options forfeited | (865,097) |  | $ | 14.53 |  |  |  |  |
Outstanding as of December 31, 2011 | 14,587,596 |  | $ | 19.73 |  |  |  |  |
Options granted | 7,789,220 |  | $ | 5.81 |  |  |  |  |
Options exercised | (221,934) |  | $ | 4.44 |  |  |  |  |
Options forfeited | (2,610,812) |  | $ | 10.91 |  |  |  |  |
Options surrendered in stock option exchange program | (6,449,255) |  | $ | 21.11 |  |  |  |  |
Outstanding as of December 31, 2012 | 13,094,815 |  | $ | 12.79 |  |  |  |  |
Options granted | 2,084,276 |  | $ | 6.09 |  |  |  |  |
Options exercised | (483,923) |  | $ | 6.72 |  |  |  |  |
Options forfeited | (3,318,022) |  | $ | 14.51 |  |  |  |  |
Outstanding as of December 31, 2013 | 11,377,146 |  | $ | 11.32 |  |  | 5.7 |  | $ | 24,540 |
Vested or expected to vest at December 31, 2013 | 10,685,898 |  | $ | 11.64 |  |  | 5.5 |  | $ | 22,113 |
Options exercisable at December 31, 2013 | 6,242,733 |  | $ | 15.35 |  |  | 3.7 |  | $ | 6,779 |
Schedule of shares authorized under Stock Option Plans, by exercise price range | The following table summarizes the information about stock options outstanding and exercisable as of December 31, 2013:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$4.13 – $5.39 | 1,087,176 |  | 8.6 |  | $ | 4.45 |  |  | 93,470 |  | $ | 4.80 |
$5.46 – $5.46 | 1,306,654 |  | 9.0 |  | $ | 5.46 |  |  | 240,292 |  |  | $ | 5.46 |
$5.49 – $5.49 | 36,918 |  | 9.1 |  | $ | 5.49 |  |  | 5,734 |  | $ | 5.49 |
$5.63 – $5.63 | 1,511,307 |  | 5.3 |  | $ | 5.63 |  |  | 724,285 |  | $ | 5.63 |
$5.76– $5.76 | 1,246,839 |  | 8.5 |  | $ | 5.76 |  |  | 219,246 |  | $ | 5.76 |
$6.39– $7.97 | 1,138,049 |  | 7.3 |  | $ | 7.27 |  |  | 531,824 |  | $ | 7.27 |
$8.11 – $13.30 | 1,177,647 |  | 5.7 |  | $ | 9.21 |  |  | 784,077 |  | $ | 9.15 |
$13.31 – $18.69 | 1,250,463 |  | 2.8 |  | $ | 16.92 |  |  | 1,138,570 |  | $ | 17.15 |
$19.13 – $21.51 | 1,318,182 |  | 2.5 |  | $ | 20.15 |  |  | 1,237,247 |  | $ | 20.10 |
$21.95 – $40.80 | 1,303,911 |  | 2.0 |  | $ | 26.12 |  |  | 1,267,988 |  | $ | 26.21 |
$4.13 – $40.80 | 11,377,146 |  | 5.7 |  | $ | 11.32 |  |  | 6,242,733 |  | $ | 15.35 |
Weighted-average assumptions for Stock Option Plans | The following table presents the weighted-average assumptions used to estimate the fair value of stock options granted that contain only service conditions in the periods presented. The assumptions used to estimate the fair value of stock options granted under the stock option exchange program are excluded from the following:
| Stock Option Plans for Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Stock Option Plans |  |  |  |  |
Expected stock price volatility | 45%-47% |  | 57%-68% |  | 50%-75%
Risk free interest rate | 0.8%-1.5% |  | 0.6%-0.9% |  | 1.4%-2.8%
Expected term (in years) | 5.4-5.5 |  | 5.5-5.7 |  | 6.0-6.1
Weighted-average fair value of stock options granted | $2.60 |  | $3.57 |  | $10.27
Weighted-average assumptions for Employee Stock Purchase Plan |
| Employee Stock Purchase Plan for Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Employee Stock Purchase Plan |  |  |  |  |
Expected stock price volatility | 44%-48% |  | 56%-63% |  | 56%-78%
Risk free interest rate | 0.1% |  | 0.2% |  | 0.1%
Expected term (in years) | 0.5 |  | 0.5 |  | 0.5
Weighted-average fair value of purchase rights granted under the purchase plan | $1.96 |  | $1.58 |  | $6.16
Activity related to nonvested equity stock and stock units | The following table reflects the activity related to nonvested equity stock and stock units for the three years ended December 31, 2013:
Nonvested Equity Stock and Stock Units | Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested at December 31, 2010 | 718,007 |  | $ | 18.23 |
Granted | 374,838 |  | $ | 17.86 |
Vested | (314,401) |  | $ | 18.15 |
Forfeited | (14,934) |  | $ | 21.76 |
Nonvested at December 31, 2011 | 763,510 |  | $ | 18.02 |
Granted | 742,009 |  | $ | 6.43 |
Vested | (393,383) |  | $ | 17.38 |
Forfeited | (189,645) |  | $ | 11.77 |
Nonvested at December 31, 2012 | 922,491 |  | $ | 10.24 |
Granted | 473,074 |  | $ | 6.92 |
Vested | (478,214) |  | $ | 9.81 |
Forfeited | (287,702) |  | $ | 9.18 |
Nonvested at December 31, 2013 | 629,649 |  | $ | 8.56 |

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