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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2016
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) | 2016 |  | 2015 |  | 2016 |  | 2015
Net income | $ | 71,545 |  |  | $ | 67,427 |  |  | $ | 199,865 |  |  | $ | 185,383 |
Net income attributable to unvested awarded performance stock | (1,873 | ) |  | (1,565 | ) |  | (5,210 | ) |  | (4,370 | )
Net income attributable to common shares | $ | 69,672 |  |  | $ | 65,862 |  |  | $ | 194,655 |  |  | $ | 181,013 |
Weighted average number of common shares outstanding – basic | 140,129 |  |  | 140,955 |  |  | 139,642 |  |  | 141,517 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (3,668 | ) |  | (3,271 | ) |  | (3,640 | ) |  | (3,336 | )
Weighted average number of common shares outstanding for basic earnings per common share | 136,461 |  |  | 137,684 |  |  | 136,002 |  |  | 138,181 |
Dilutive effect of stock options | 1,721 |  |  | 2,357 |  |  | 1,582 |  |  | 2,265 |
Weighted average number of shares outstanding – diluted | 138,182 |  |  | 140,041 |  |  | 137,584 |  |  | 140,446 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.51 |  |  | $ | 0.48 |  |  | $ | 1.43 |  |  | $ | 1.31 |
Diluted | $ | 0.50 |  |  | $ | 0.47 |  |  | $ | 1.41 |  |  | $ | 1.29 |

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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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