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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of calculation of basic and diluted earnings per share | The following table sets forth the calculations of basic and diluted earnings per share:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in thousands, except per share amounts)
Net income | $ | 76,522 |  |  | $ | 24,889 |  |  | $ | 93,249 |  |  | $ | 51,225 |
Basic weighted-average common shares outstanding | 66,295 |  |  | 64,585 |  |  | 66,254 |  |  | 64,345 |
Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs | 1,598 |  |  | 2,149 |  |  | 1,457 |  |  | 2,182 |
Add: dilutive effect of 3.50% Senior Convertible Notes | — |  |  | 822 |  |  | — |  |  | 1,279 |
Diluted weighted-average common shares outstanding | 67,893 |  |  | 67,556 |  |  | 67,711 |  |  | 67,806 |
Basic net income per common share | $ | 1.15 |  |  | $ | 0.39 |  |  | $ | 1.41 |  |  | $ | 0.80 |
Diluted net income per common share | $ | 1.13 |  |  | $ | 0.37 |  |  | $ | 1.38 |  |  | $ | 0.76 |

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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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