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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
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) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income | $ | 75,913 |  |  | $ | 71,545 |  |  | $ | 212,125 |  |  | $ | 199,865 |
Net income attributable to unvested awarded performance stock | (1,852 | ) |  | (1,873 | ) |  | (5,181 | ) |  | (5,210 | )
Net income attributable to common shares | $ | 74,061 |  |  | $ | 69,672 |  |  | $ | 206,944 |  |  | $ | 194,655 |
Weighted average number of common shares outstanding – basic | 139,756 |  |  | 140,129 |  |  | 140,012 |  |  | 139,642 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (3,410 | ) |  | (3,668 | ) |  | (3,420 | ) |  | (3,640 | )
Weighted average number of common shares outstanding for basic earnings per common share | 136,346 |  |  | 136,461 |  |  | 136,592 |  |  | 136,002 |
Dilutive effect of stock options | 2,547 |  |  | 1,721 |  |  | 2,419 |  |  | 1,582 |
Weighted average number of shares outstanding – diluted | 138,893 |  |  | 138,182 |  |  | 139,011 |  |  | 137,584 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.54 |  |  | $ | 0.51 |  |  | $ | 1.52 |  |  | $ | 1.43 |
Diluted | $ | 0.53 |  |  | $ | 0.50 |  |  | $ | 1.49 |  |  | $ | 1.41 |

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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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