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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Reconciliation Between Basic and Diluted Weighted Average Shares Outstanding |
|  | For the three months ended September 30, |  |  | For the nine months ended September 30, |
(in thousands, except per share data) |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net income |  | $ | 49,504 |  |  | $ | 44,173 |  |  | $ | 141,408 |  |  | $ | 127,501 |
Net income attributable to unvested awarded performance stock |  |  | (1,428 | ) |  |  | (1,395 | ) |  |  | (4,174 | ) |  |  | (3,959 | )
Net income attributable to common shares |  | $ | 48,076 |  |  | $ | 42,778 |  |  | $ | 137,234 |  |  | $ | 123,542 |
Weighted average number of common shares outstanding – basic |  |  | 143,607 |  |  |  | 143,212 |  |  |  | 143,418 |  |  |  | 142,913 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (4,142 | ) |  |  | (4,522 | ) |  |  | (4,233 | ) |  |  | (4,438 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 139,465 |  |  |  | 138,690 |  |  |  | 139,185 |  |  |  | 138,475 |
Dilutive effect of stock options |  |  | 2,632 |  |  |  | 1,753 |  |  |  | 2,584 |  |  |  | 1,645 |
Weighted average number of shares outstanding – diluted |  |  | 142,097 |  |  |  | 140,443 |  |  |  | 141,769 |  |  |  | 140,120 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.34 |  |  | $ | 0.31 |  |  | $ | 0.99 |  |  | $ | 0.89 |
Diluted |  | $ | 0.34 |  |  | $ | 0.30 |  |  | $ | 0.97 |  |  | $ | 0.88 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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