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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted earnings (loss) per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Weighted-average common shares outstanding - basic | 48,008,998 |  |  | 47,944,193 |  |  | 47,934,810 |  |  | 46,155,846 |
Dilutive effect of equity-based incentive awards | — |  |  | 994,573 |  |  | — |  |  | 1,052,259 |
Weighted-average common shares outstanding - diluted | 48,008,998 |  |  | 48,938,766 |  |  | 47,934,810 |  |  | 47,208,105 |
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share | 958,727 |  |  | 54,260 |  |  | 960,622 |  |  | 34,260 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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