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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 73,922 |  |  | $ | 66,102 |  |  | $ | 164,750 |  |  | $ | 136,212 |
Net income attributable to unvested awarded performance stock | (1,618 | ) |  | (1,642 | ) |  | (3,529 | ) |  | (3,329 | )
Net income attributable to common shares | $ | 72,304 |  |  | $ | 64,460 |  |  | $ | 161,221 |  |  | $ | 132,883 |
Weighted average number of common shares outstanding – basic | 276,123 |  |  | 280,346 |  |  | 276,038 |  |  | 280,286 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (6,042 | ) |  | (6,962 | ) |  | (5,912 | ) |  | (6,850 | )
Weighted average number of common shares outstanding for basic net income per common share | 270,081 |  |  | 273,384 |  |  | 270,126 |  |  | 273,436 |
Dilutive effect of stock options | 5,827 |  |  | 4,818 |  |  | 5,683 |  |  | 4,692 |
Weighted average number of shares outstanding – diluted | 275,908 |  |  | 278,202 |  |  | 275,809 |  |  | 278,128 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.27 |  |  | $ | 0.24 |  |  | $ | 0.60 |  |  | $ | 0.49 |
Diluted | $ | 0.26 |  |  | $ | 0.23 |  |  | $ | 0.58 |  |  | $ | 0.48 |

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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://www.xbrl.org/2003/role/presentationRef -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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