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Stock-based Compensation (Weighted-Average Assumptions) (Details)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Expected dividend yield | 0.00% | ||
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Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Volatility | 59.00% | 58.00% | 51.00% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Risk-free rate | 1.40% | 1.40% | 1.60% |
| Expected term (in years) | 6 years 3 months | 6 years 3 months | 6 years 3 months |