Employee Equity Incentive Plans (Tables) |
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| Employee Benefits and Share-based Compensation [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 shares of 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 (no market-based restricted stock units were granted in the third quarter of 2015). We based the weighted average estimated value 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, for each period as follows:
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| Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
Restricted stock unit activity in the first nine months of 2015 was as follows:
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| Schedule of Stock Options Roll Forward [Table Text Block] |
Stock option activity in the first nine months of 2015 was as follows:
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