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Stock-Based Compensation - Fair Value of Options Estimated Using Black-Scholes Option Pricing Model (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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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Risk-free interest rates | 1.11% | 0.69% | 1.55% |
| Expected term | 5 years | 5 years | 5 years |
| Expected dividends | 0.00% | 0.00% | 0.00% |
| Expected volatility | 46.80% | 49.00% | 52.10% |