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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
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 income per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Weighted-average common shares outstanding - basic | 47,944,193 |  |  | 40,994,082 |  |  | 46,155,846 |  |  | 38,104,500 |
Dilutive effect of Equity-based Incentive Awards | 994,573 |  |  | 1,459,700 |  |  | 1,052,259 |  |  | 1,373,116 |
Weighted-average common shares outstanding - diluted | 48,938,766 |  |  | 42,453,782 |  |  | 47,208,105 |  |  | 39,477,616 |
Anti-dilutive Equity-based Incentive Awards excluded from the computation of diluted income per share | 54,260 |  |  | 37,760 |  |  | 34,260 |  |  | 69,960 |

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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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