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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Stock Option Plans, USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Stock Option Plans |  |  |  |
Number of Shares |  |  |  |
Outstanding, at the beginning of the period (in shares) |  |  | 13,969,383 |
Stock option granted (in shares) | 78,510 | 138,350 | 1,712,211 | 1,725,323
Options exercised (in shares) |  |  | (478,974) |
Stock options forfeited (in shares) |  |  | (447,417) |
Outstanding, at the end of the period (in shares) | 14,755,203 |  | 14,755,203 |
Vested or expected to vest at the end of the period (in shares) | 14,209,999 |  | 14,209,999 |
Options exercisable at the end of the period (in shares) | 10,199,075 |  | 10,199,075 |
Weighted Average Exercise Price |  |  |  |
Outstanding at the beginning of the year (in dollars per share) |  |  | $ 18.85 |
Options granted (in dollars per share) | $ 20.71 |  | $ 20.71 |
Options exercised (in dollars per share) | $ 10.29 |  | $ 10.29 |
Options forfeited (in dollars per share) |  |  | $ 11.48 |
Outstanding at the end of the period (in dollars per share) | $ 19.57 |  | $ 19.57 |
Vested or expected to vest at the end of the period (in shares) | $ 19.56 |  | $ 19.56 |
Options exercisable at the end of the period (in shares) | $ 19.76 |  | $ 19.76 |
Weighted Average Remaining Contractual Term (in years) |  |  |  |
Outstanding (in years) | 5.61 |  | 5.61 |
Vested or expected to vest (in years) |  |  | 5.49 |
Options exercisable (in years) |  |  | 4.36 |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 14,793 |  | $ 14,793 |
Vested or expected to vest | 14,406 |  | 14,406 |
Options exercisable | $ 10,787 |  | $ 10,787 |
Closing stock price (in dollars per share) | $ 14.68 |  | $ 14.68 |
Total number of in-the-money outstanding (in shares) | 2,529,882 |  | 2,529,882 |
Total number of in-the-money exercisable (in shares) | 1,819,311 |  | 1,819,311 |

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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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