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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |  |  | Six months ended June 30, |
(in thousands, except per share data) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net income |  | $ | 139,290 |  |  | $ | 96,784 |  |  | $ | 339,033 |  |  | $ | 249,184 |
Net income attributable to unvested awarded performance stock |  |  | (3,010 | ) |  |  | (3,580 | ) |  |  | (7,876 | ) |  |  | (8,855 | )
Net income attributable to common shares |  | $ | 136,280 |  |  | $ | 93,204 |  |  | $ | 331,157 |  |  | $ | 240,329 |
Weighted average number of common shares outstanding – basic |  |  | 281,784 |  |  |  | 283,591 |  |  |  | 282,200 |  |  |  | 282,994 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (6,090 | ) |  |  | (10,491 | ) |  |  | (6,556 | ) |  |  | (10,056 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 275,694 |  |  |  | 273,100 |  |  |  | 275,644 |  |  |  | 272,938 |
Dilutive effect of potentially issuable common shares |  |  | 1,183 |  |  |  | 1,262 |  |  |  | 1,270 |  |  |  | 1,581 |
Weighted average number of shares outstanding – diluted |  |  | 276,877 |  |  |  | 274,362 |  |  |  | 276,914 |  |  |  | 274,519 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.49 |  |  | $ | 0.34 |  |  | $ | 1.20 |  |  | $ | 0.88 |
Diluted |  | $ | 0.49 |  |  | $ | 0.34 |  |  | $ | 1.20 |  |  | $ | 0.88 |

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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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