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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding |
| For the three months ended September 30, |  | For the nine months ended September 30,
(in thousands, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 106,053 |  |  | $ | 75,913 |  |  | $ | 270,803 |  |  | $ | 212,125 |
Net income attributable to unvested awarded performance stock | (2,716 | ) |  | (1,852 | ) |  | (6,185 | ) |  | (5,181 | )
Net income attributable to common shares | $ | 103,337 |  |  | $ | 74,061 |  |  | $ | 264,618 |  |  | $ | 206,944 |
Weighted average number of common shares outstanding – basic | 278,132 |  |  | 279,512 |  |  | 276,744 |  |  | 280,024 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (7,124 | ) |  | (6,820 | ) |  | (6,321 | ) |  | (6,840 | )
Weighted average number of common shares outstanding for basic net income per common share | 271,008 |  |  | 272,692 |  |  | 270,423 |  |  | 273,184 |
Dilutive effect of stock options | 4,274 |  |  | 5,094 |  |  | 5,191 |  |  | 4,838 |
Weighted average number of shares outstanding – diluted | 275,282 |  |  | 277,786 |  |  | 275,614 |  |  | 278,022 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.38 |  |  | $ | 0.27 |  |  | $ | 0.98 |  |  | $ | 0.76 |
Diluted | $ | 0.38 |  |  | $ | 0.27 |  |  | $ | 0.96 |  |  | $ | 0.74 |

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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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