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Share-based Compensation Plans and Awards - Fair Value Assumptions Stock Options (Details) (Stock options [Member], USD $)
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9 Months Ended |
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Sep. 30, 2011
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Stock options [Member]
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| Weighted-average assumptions used to estimate the fair values of the stock options | |
| Expected life (in years) | 5 years 6 months |
| Risk-free interest rate | 1.97% |
| Expected volatility | 56.00% |
| Expected dividend yield | 0.00% |
| Weighted-average estimated fair value of options granted during the period (usd per share) | $ 16.64 |