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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
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) | 2019 |  | 2018 |  | 2019 |  | 2018
Net income | $ | 92,593 |  |  | $ | 73,922 |  |  | $ | 206,489 |  |  | $ | 164,750 |
Net income attributable to unvested awarded performance stock | (3,020 | ) |  | (1,618 | ) |  | (6,273 | ) |  | (3,529 | )
Net income attributable to common shares | $ | 89,573 |  |  | $ | 72,304 |  |  | $ | 200,216 |  |  | $ | 161,221 |
Weighted average number of common shares outstanding – basic | 281,754 |  |  | 276,123 |  |  | 281,163 |  |  | 276,038 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (9,191 | ) |  | (6,042 | ) |  | (8,542 | ) |  | (5,912 | )
Weighted average number of common shares outstanding for basic net income per common share | 272,563 |  |  | 270,081 |  |  | 272,621 |  |  | 270,126 |
Dilutive effect of stock options | 1,839 |  |  | 5,827 |  |  | 2,083 |  |  | 5,683 |
Weighted average number of shares outstanding – diluted | 274,402 |  |  | 275,908 |  |  | 274,704 |  |  | 275,809 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.33 |  |  | $ | 0.27 |  |  | $ | 0.73 |  |  | $ | 0.60 |
Diluted | $ | 0.33 |  |  | $ | 0.26 |  |  | $ | 0.73 |  |  | $ | 0.58 |

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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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