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, | | 2012 | | 2011 | | 2012 | | 2011 | | (in thousands, except per share amounts) | Net income | $ | 24,889 |
| | $ | 124,533 |
| | $ | 51,225 |
| | $ | 106,030 |
| Basic weighted-average common shares outstanding | 64,585 |
| | 63,638 |
| | 64,345 |
| | 63,543 |
| Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs | 2,149 |
| | 2,182 |
| | 2,182 |
| | 2,161 |
| Add: dilutive effect of 3.50% Senior Convertible Notes | 822 |
| | 1,089 |
| | 1,279 |
| | 991 |
| Diluted weighted-average common shares outstanding | 67,556 |
| | 66,909 |
| | 67,806 |
| | 66,695 |
| Basic net income per common share | $ | 0.39 |
| | $ | 1.96 |
| | $ | 0.80 |
| | $ | 1.67 |
| Diluted net income per common share | $ | 0.37 |
| | $ | 1.86 |
| | $ | 0.76 |
| | $ | 1.59 |
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