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Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding |
| Three months ended March 31,
(in thousands, except per share data) | 2018 |  | 2017
Net income | $ | 90,828 |  |  | $ | 70,110 |
Net income attributable to unvested awarded performance stock | (1,902 | ) |  | (1,686 | )
Net income attributable to common shares | $ | 88,926 |  |  | $ | 68,424 |
Weighted average number of common shares outstanding – basic | 275,952 |  |  | 280,224 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (5,780 | ) |  | (6,737 | )
Weighted average number of common shares outstanding for basic net income per common share | 270,172 |  |  | 273,487 |
Dilutive effect of stock options | 5,542 |  |  | 4,565 |
Weighted average number of shares outstanding – diluted | 275,714 |  |  | 278,052 |
Net income per share: |  |  |
Basic | $ | 0.33 |  |  | $ | 0.25 |
Diluted | $ | 0.32 |  |  | $ | 0.25 |

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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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