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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
| 2013 |  | 2012
Weighted-average common shares outstanding - basic | 47,859,774 |  |  | 44,367,499 |
Dilutive effect of equity-based incentive awards | 494,670 |  |  | 1,403,729 |
Weighted-average common shares outstanding - diluted | 48,354,444 |  |  | 45,771,228 |
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income per share | 525,410 |  |  | 7,000 |

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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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