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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding | The following is a 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) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income |  | $ | 57,749 |  |  | $ | 49,504 |  |  | $ | 169,887 |  |  | $ | 141,408 |
Net income attributable to unvested awarded performance stock |  |  | (1,626 | ) |  |  | (1,428 | ) |  |  | (4,092 | ) |  |  | (4,174 | )
Net income attributable to common shares |  | $ | 56,123 |  |  | $ | 48,076 |  |  | $ | 165,795 |  |  | $ | 137,234 |
Weighted average number of common shares outstanding – basic |  |  | 145,228 |  |  |  | 143,607 |  |  |  | 144,403 |  |  |  | 143,418 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (4,089 | ) |  |  | (4,142 | ) |  |  | (3,478 | ) |  |  | (4,233 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 141,139 |  |  |  | 139,465 |  |  |  | 140,925 |  |  |  | 139,185 |
Dilutive effect of stock options |  |  | 1,650 |  |  |  | 2,632 |  |  |  | 1,551 |  |  |  | 2,584 |
Weighted average number of shares outstanding – diluted |  |  | 142,789 |  |  |  | 142,097 |  |  |  | 142,476 |  |  |  | 141,769 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.40 |  |  | $ | 0.34 |  |  | $ | 1.18 |  |  | $ | 0.99 |
Diluted |  | $ | 0.39 |  |  | $ | 0.34 |  |  | $ | 1.16 |  |  | $ | 0.97 |

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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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