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Stock-Based Compensation Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Share-based Compensation [Abstract] |
Schedule of share-based payment award, stock options, valuation assumptions | The weighted-average assumptions used to value options as of their grant date were as follows:
| Nine Months Ended |  | Nine Months Ended
| September 30, 2013 |  | September 30, 2012
Risk-free interest rate | 1.06 | % |  | 0.72 | %
Expected volatility | 50.89 | % |  | 64.60 | %
Expected life (in years) | 4.24 |  |  | 4.22 |
Dividend yield | 0 | % |  | 0 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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