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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
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) | 2015 |  | 2014 |  | 2015 |  | 2014
Net income | $ | 67,427 |  |  | $ | 68,331 |  |  | $ | 185,383 |  |  | $ | 182,501 |
Net income attributable to unvested awarded performance stock | (1,565 | ) |  | (1,681 | ) |  | (4,370 | ) |  | (4,604 | )
Net income attributable to common shares | $ | 65,862 |  |  | $ | 66,650 |  |  | $ | 181,013 |  |  | $ | 177,897 |
Weighted average number of common shares outstanding – basic | 140,955 |  |  | 144,469 |  |  | 141,517 |  |  | 144,909 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (3,271 | ) |  | (3,554 | ) |  | (3,336 | ) |  | (3,656 | )
Weighted average number of common shares outstanding for basic earnings per common share | 137,684 |  |  | 140,915 |  |  | 138,181 |  |  | 141,253 |
Dilutive effect of stock options | 2,357 |  |  | 2,049 |  |  | 2,265 |  |  | 1,849 |
Weighted average number of shares outstanding – diluted | 140,041 |  |  | 142,964 |  |  | 140,446 |  |  | 143,102 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.48 |  |  | $ | 0.47 |  |  | $ | 1.31 |  |  | $ | 1.26 |
Diluted | $ | 0.47 |  |  | $ | 0.47 |  |  | $ | 1.29 |  |  | $ | 1.24 |

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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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