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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Reconciliation of the Components of Basic and Diluted Net Income per Common Share | Reconciliations of the components of basic and diluted net income per common share are presented in the tables below:
| Three months ended March 31,
| 2018 |  | 2017
| Income |  | Shares |  | Per Share |  | Income |  | Shares |  | Per Share
| (In thousands, except share data)
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 90,090 |  |  | 180,714,881 |  |  | $ | 0.50 |  |  | $ | 154,455 |  |  | 170,272,685 |  |  | $ | 0.91 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options and awards | — |  |  | 87,420 |  |  |  |  | — |  |  | 215,834 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 90,090 |  |  | 180,802,301 |  |  | $ | 0.50 |  |  | $ | 154,455 |  |  | 170,488,519 |  |  | $ | 0.91 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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