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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | For the six months ended June 30,
(in thousands, except per share data) | 2016 |  | 2015 |  | 2016 |  | 2015
Net income | $ | 66,250 |  |  | $ | 61,005 |  |  | $ | 128,320 |  |  | $ | 117,956 |
Net income attributable to unvested awarded performance stock | (1,896 | ) |  | (1,439 | ) |  | (3,337 | ) |  | (2,802 | )
Net income attributable to common shares | $ | 64,354 |  |  | $ | 59,566 |  |  | $ | 124,983 |  |  | $ | 115,154 |
Weighted average number of common shares outstanding – basic | 139,998 |  |  | 140,839 |  |  | 139,395 |  |  | 141,803 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (4,006 | ) |  | (3,321 | ) |  | (3,625 | ) |  | (3,369 | )
Weighted average number of common shares outstanding for basic earnings per common share | 135,992 |  |  | 137,518 |  |  | 135,770 |  |  | 138,434 |
Dilutive effect of stock options | 1,589 |  |  | 2,310 |  |  | 1,490 |  |  | 2,213 |
Weighted average number of shares outstanding – diluted | 137,581 |  |  | 139,828 |  |  | 137,260 |  |  | 140,647 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.47 |  |  | $ | 0.43 |  |  | $ | 0.92 |  |  | $ | 0.83 |
Diluted | $ | 0.47 |  |  | $ | 0.43 |  |  | $ | 0.91 |  |  | $ | 0.82 |

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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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