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Equity-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Option Award Activity Detail [Table] |  |  |
Outstanding at December 31, 2012 | 4,333,000 |  |
Outstanding at December 31, 2012, weighted average option price per share | $ 11.85 |  |
Options granted | 695,000 |  |
Options granted, weighted average option price per share | $ 10.38 |  |
Options cancelled | (339,000) |  |
Options cancelled, weighted average option price per share | $ 14.00 |  |
Options exercised | (397,000) |  |
Options exercised, weighted average option price per share | $ 5.48 |  |
Outstanding at December 31, 2013 | 4,292,000 | 4,333,000 |
Outstanding at December 31, 2013, weighted average option price per share | $ 12.03 | $ 11.85 |
Options expected to vest | 1,000,000 |  |
Options expected to vest, weighted average option price per share | $ 9.47 |  |
Options exercisable at period end | 3,293,000 |  |
Options exercisable at period end, weighted average option price per share | $ 12.81 |  |
Available for grant, period end | 4,289,000 |  |
Total intrinsic value of options exercised | $ 0.7 | $ 0.6 | $ 2.5
Intrinsic value of options outstanding | 13.7 |  |
Intrinsic value of options expected to vest | 2.9 |  |
Intrinsic value of options exercisable | 10.8 |  |
Cash received from options exercised | 2.3 | 0.9 | 3.4
Recognized excess tax benefit from the exercise of stock options | (0.1) | (1.7) | 1.3
Stock Option Valuation Assumptions Detail [Table] |  |  |
Expected stock price volatility (minimum) | 54.00% | 74.00% | 72.00%
Expected stock price volatility (maximum) | 74.00% | 75.00% | 75.00%
Expected life of options | 4 years 328 days | 4 years 292 days | 4 years 255 days
Risk free interest rate (minimum) | 0.76% | 0.62% | 0.87%
Risk free interest rate (maximum) | 1.48% | 1.03% | 2.24%
Expected dividend yield | 0.00% | 0.00% | 0.00%
Weighted average fair value of options granted | $ 6.00 | $ 4.06 | $ 7.55
Total estimated unrecognized compensation cost | $ 8.4 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 182 days |  |
Shares surrendered in payment of option exercise | 119,477 | 81,616 | 592,992
Shares surrendered related to restricted stock vesting | 40,163 | 24,121 | 52,065
Maximum number of shares issuable under stock options outstanding and stock options authorized for future grants | 6,178,178 |  |

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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