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Stock-Based Compensation (Assumptions Used and Resulting Estimates of Weighted Average Fair Value Per Share of Options Granted) (Details) (USD $)
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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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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected volatility, Minimum | 51.00% | 49.00% |
| Expected volatility, Maximum | 52.00% | 51.00% |
| Risk-free interest rate, Minimum | 1.00% | 0.70% |
| Risk-free interest rate, Maximum | 1.30% | 1.20% |
| Expected dividend yield | 0.00% | 0.00% |
| Weighted-average fair value of options granted during the period | $ 1.76 | $ 0.66 |
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Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (years) | 5 years 6 months | 5 years 6 months |
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Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (years) | 6 years 1 month 6 days | 6 years 1 month 6 days |