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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings (Loss) Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract] |
Earnings (Loss) Per Share |
| 2018 |  | 2017
Quarter | Basic |  | Diluted |  | Basic |  | Diluted
Net earnings | $ | 263,861 |  |  | 263,861 |  |  | 265,583 |  |  | 265,583
Average shares outstanding |  | 127,161 |  |  | 127,161 |  |  | 125,170 |  |  | 125,170
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Options and other share-based awards |  | - |  |  | 731 |  |  | - |  |  | 1,980
Equivalent Shares |  | 127,161 |  |  | 127,892 |  |  | 125,170 |  |  | 127,150
Net earnings per common share | $ | 2.08 |  |  | 2.06 |  |  | 2.12 |  |  | 2.09
| 2018 |  | 2017
Nine Months | Basic |  | Diluted |  | Basic |  | Diluted
Net earnings | $ | 211,668 |  |  | 211,668 |  |  | 401,905 |  |  | 401,905
Average shares outstanding |  | 125,982 |  |  | 125,982 |  |  | 125,204 |  |  | 125,204
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Options and other share-based awards |  | - |  |  | 792 |  |  | - |  |  | 2,044
Equivalent Shares |  | 125,982 |  |  | 126,774 |  |  | 125,204 |  |  | 127,248
Net earnings per common share | $ | 1.68 |  |  | 1.67 |  |  | 3.21 |  |  | 3.16

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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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