Employee Equity Incentive Plans (Tables)
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Dec. 31, 2011
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Employee Equity Incentive Plans (Tables) [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Restricted Stock Units Estimated Values And Weighted Average Assumptions [Table Text Block] |
We estimate the fair value of restricted stock unit awards with time-based vesting using the value of our common stock on the date of grant, reduced by the present value of dividends expected to be paid on our common stock prior to vesting. We estimate the fair value of market-based restricted stock units using a Monte Carlo simulation model on the date of grant. We based the weighted average estimated values of restricted stock unit grants, as well as the weighted average assumptions that we used in calculating the fair value, on estimates at the date of grant, as follows:
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Stock Options And Stock Purchase Plan Estimated Values And Weighted Average Assumptions [Table Text Block] |
We use the Black-Scholes option pricing model to estimate the fair value of options granted under our equity incentive plans and rights to acquire stock granted under our stock purchase plan. We based the weighted average estimated values of employee stock option grants (excluding stock option grants in connection with the Option Exchange in 2009) and rights granted under the stock purchase plan, as well as the weighted average assumptions used in calculating these values, on estimates at the date of grant, as follows:
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Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
Information with respect to outstanding restricted stock unit (RSU) activity is as follows:
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Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] |
As of December 31, 2011, options outstanding that have vested and are expected to vest are as follows:
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Stock Options Activity [Table Text Block] |
Additional information with respect to stock option activity is as follows:
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Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
The following table summarizes information about options outstanding as of December 31, 2011:
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