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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | For the six months ended June 30,
(in thousands, except per share data) | 2015 |  | 2014 |  | 2015 |  | 2014
Net income | $ | 61,005 |  |  | $ | 61,755 |  |  | $ | 117,956 |  |  | $ | 114,170 |
Net income attributable to unvested awarded performance stock | (1,439 | ) |  | (1,531 | ) |  | (2,802 | ) |  | (2,915 | )
Net income attributable to common shares | $ | 59,566 |  |  | $ | 60,224 |  |  | $ | 115,154 |  |  | $ | 111,255 |
Weighted average number of common shares outstanding – basic | 140,839 |  |  | 144,840 |  |  | 141,803 |  |  | 145,133 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (3,321 | ) |  | (3,590 | ) |  | (3,369 | ) |  | (3,705 | )
Weighted average number of common shares outstanding for basic earnings per common share | 137,518 |  |  | 141,250 |  |  | 138,434 |  |  | 141,428 |
Dilutive effect of stock options | 2,310 |  |  | 1,782 |  |  | 2,213 |  |  | 1,741 |
Weighted average number of shares outstanding – diluted | 139,828 |  |  | 143,032 |  |  | 140,647 |  |  | 143,169 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.43 |  |  | $ | 0.43 |  |  | $ | 0.83 |  |  | $ | 0.79 |
Diluted | $ | 0.43 |  |  | $ | 0.42 |  |  | $ | 0.82 |  |  | $ | 0.78 |

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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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