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Stock-Based Compensation Stock-Based Compensation (Details 3) (Details)
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9 Months Ended |
|---|---|
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Sep. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | |
| Equity based awards, beginning of period | 6,907,924 |
| Granted | 1,474,900 |
| Canceled | (7,578) |
| Forfeited | (262,897) |
| Equity based awards, end of period | 5,703,499 |