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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
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:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
(in thousands, except per share data) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net income |  | $ | 146,354 |  |  | $ | 133,979 |  |  | $ | 485,387 |  |  | $ | 383,163 |
Net income attributable to unvested awarded performance stock |  |  | (3,069 | ) |  |  | (3,740 | ) |  |  | (10,901 | ) |  |  | (12,634 | )
Net income attributable to common shares |  | $ | 143,285 |  |  | $ | 130,239 |  |  | $ | 474,486 |  |  | $ | 370,529 |
Weighted average number of common shares outstanding – basic |  |  | 282,132 |  |  |  | 283,426 |  |  |  | 282,177 |  |  |  | 283,139 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (5,917 | ) |  |  | (7,911 | ) |  |  | (6,337 | ) |  |  | (9,336 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 276,215 |  |  |  | 275,515 |  |  |  | 275,840 |  |  |  | 273,803 |
Dilutive effect of potentially issuable common shares |  |  | 1,338 |  |  |  | 1,418 |  |  |  | 1,306 |  |  |  | 1,535 |
Weighted average number of shares outstanding – diluted |  |  | 277,553 |  |  |  | 276,933 |  |  |  | 277,146 |  |  |  | 275,338 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.52 |  |  | $ | 0.47 |  |  | $ | 1.72 |  |  | $ | 1.35 |
Diluted |  | $ | 0.52 |  |  | $ | 0.47 |  |  | $ | 1.71 |  |  | $ | 1.35 |

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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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