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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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 years ended December 31:
(in thousands, except per share data) | 2018 |  | 2017(1) |  | 2016(1)
Net income | $ | 344,255 |  |  | $ | 399,630 |  |  | $ | 257,491 |
Net income attributable to unvested awarded performance stock | (8,297 | ) |  | (9,746 | ) |  | (6,705 | )
Net income attributable to common shares | $ | 335,958 |  |  | $ | 389,884 |  |  | $ | 250,786 |
Weighted average number of common shares outstanding – basic | 277,663 |  |  | 279,394 |  |  | 279,558 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (6,692 | ) |  | (6,814 | ) |  | (7,280 | )
Weighted average number of common shares outstanding for basic earnings per common share | 270,971 |  |  | 272,580 |  |  | 272,278 |
Dilutive effect of stock options | 4,550 |  |  | 5,006 |  |  | 3,330 |
Weighted average number of shares outstanding – diluted | 275,521 |  |  | 277,586 |  |  | 275,608 |
Net income per share: |  |  |  |  |
Basic | $ | 1.24 |  |  | $ | 1.43 |  |  | $ | 0.92 |
Diluted | $ | 1.22 |  |  | $ | 1.40 |  |  | $ | 0.91 |

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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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