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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
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 three months ended June 30, |  |  | For the six months ended June 30, |
(in thousands, except per share data) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net income |  | $ | 96,784 |  |  | $ | 92,593 |  |  | $ | 249,184 |  |  | $ | 206,489 |
Net income attributable to unvested awarded performance stock |  |  | (3,580 | ) |  |  | (3,020 | ) |  |  | (8,855 | ) |  |  | (6,273 | )
Net income attributable to common shares |  | $ | 93,204 |  |  | $ | 89,573 |  |  | $ | 240,329 |  |  | $ | 200,216 |
Weighted average number of common shares outstanding – basic |  |  | 283,591 |  |  |  | 281,754 |  |  |  | 282,994 |  |  |  | 281,163 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (10,491 | ) |  |  | (9,191 | ) |  |  | (10,056 | ) |  |  | (8,542 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 273,100 |  |  |  | 272,563 |  |  |  | 272,938 |  |  |  | 272,621 |
Dilutive effect of stock options |  |  | 1,262 |  |  |  | 1,839 |  |  |  | 1,581 |  |  |  | 2,083 |
Weighted average number of shares outstanding – diluted |  |  | 274,362 |  |  |  | 274,402 |  |  |  | 274,519 |  |  |  | 274,704 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.34 |  |  | $ | 0.33 |  |  | $ | 0.88 |  |  | $ | 0.73 |
Diluted |  | $ | 0.34 |  |  | $ | 0.33 |  |  | $ | 0.88 |  |  | $ | 0.73 |

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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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