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Earnings Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income for basic and diluted earnings per share | $ | 810,391 |  |  | $ | 752,842 |  |  | $ | 1,495,339 |  |  | $ | 1,337,094 |
Weighted-average common shares outstanding | 209,054 |  |  | 214,694 |  |  | 211,099 |  |  | 214,882 |
Dilutive effect of stock-based awards and stock options | 874 |  |  | 1,130 |  |  | 874 |  |  | 1,023 |
Diluted weighted-average shares outstanding | 209,928 |  |  | 215,824 |  |  | 211,973 |  |  | 215,905 |
Basic earnings per share | $ | 3.88 |  |  | $ | 3.51 |  |  | $ | 7.08 |  |  | $ | 6.22 |
Diluted earnings per share | $ | 3.86 |  |  | $ | 3.49 |  |  | $ | 7.05 |  |  | $ | 6.19 |
There were no antidilutive shares for the quarters and nine months ended September 30, 2018 and 2017.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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