The following table shows the amounts used in computing our basic and diluted earnings per common share:
| | | | | | | | | | | | | | For the Year Ended December 31, | | 2012 | | 2011 | | 2010 | | (In thousands, except per share amounts) | Numerator for basic and diluted earnings per share: | | | | | | Income from continuing operations attributable to common stockholders | $ | 305,573 |
| | $ | 363,133 |
| | $ | 213,444 |
| Discontinued operations | 57,227 |
| | 1,360 |
| | 32,723 |
| Net income attributable to common stockholders | $ | 362,800 |
| | $ | 364,493 |
| | $ | 246,167 |
| Denominator: | | | | | | Denominator for basic earnings per share—weighted average shares | 292,064 |
| | 228,453 |
| | 156,608 |
| Effect of dilutive securities: | | | | | | Stock options | 496 |
| | 449 |
| | 407 |
| Restricted stock awards | 92 |
| | 53 |
| | 70 |
| OP units | 1,836 |
| | 942 |
| | — |
| Convertible notes | — |
| | 893 |
| | 572 |
| Denominator for diluted earnings per share—adjusted weighted average shares | 294,488 |
| | 230,790 |
| | 157,657 |
| Basic earnings per share: | | | | | | Income from continuing operations attributable to common stockholders | $ | 1.04 |
| | $ | 1.59 |
| | $ | 1.36 |
| Discontinued operations | 0.20 |
| | 0.01 |
| | 0.21 |
| Net income attributable to common stockholders | $ | 1.24 |
| | $ | 1.60 |
| | $ | 1.57 |
| Diluted earnings per share: | | | | | | Income from continuing operations attributable to common stockholders | $ | 1.04 |
| | $ | 1.57 |
| | $ | 1.35 |
| Discontinued operations | 0.19 |
| | 0.01 |
| | 0.21 |
| Net income attributable to common stockholders | $ | 1.23 |
| | $ | 1.58 |
| | $ | 1.56 |
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