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Equity Incentive Plan (Tables) | 6 Months Ended
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Jun. 30, 2013
Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards | The fair value of each stock option award during the three and six months ended June 30, 2013 and the six months ended June 30, 2012 was estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions:
| Three Months Ended
| June 30,
| 2013 |  | 2012
Risk free interest rate | 0.65% |  | -
Expected volatility | 57.60% |  | -
Expected lives (years) | 4 |  | -
Expected dividend yield | 0.00% |  | -
| Six Months Ended
| June 30,
| 2013 |  | 2012
Risk free interest rate | 0.61% - 0.70% |  | 0.64%
Expected volatility | 57.60% |  | 57.60%
Expected lives (years) | 4 |  | 4
Expected dividend yield | 0.00% |  | 0.00%

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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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