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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [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) |  | 2020 |  |  | 2019 |  |  | 2018 |
Net income |  | $ | 480,483 |  |  | $ | 398,514 |  |  | $ | 344,255 |
Net income attributable to unvested awarded performance stock |  |  | (15,197 | ) |  |  | (12,873 | ) |  |  | (8,297 | )
Net income attributable to common shares |  | $ | 465,286 |  |  | $ | 385,641 |  |  | $ | 335,958 |
Weighted average number of common shares outstanding – basic |  |  | 283,294 |  |  |  | 281,566 |  |  |  | 277,663 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (8,960 | ) |  |  | (9,095 | ) |  |  | (6,692 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 274,334 |  |  |  | 272,471 |  |  |  | 270,971 |
Dilutive effect of stock options |  |  | 1,533 |  |  |  | 2,145 |  |  |  | 4,550 |
Weighted average number of shares outstanding – diluted |  |  | 275,867 |  |  |  | 274,616 |  |  |  | 275,521 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.70 |  |  | $ | 1.42 |  |  | $ | 1.24 |
Diluted |  | $ | 1.69 |  |  | $ | 1.40 |  |  | $ | 1.22 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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