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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation Between Basic and Diluted Earnings Per Share | A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income for basic and diluted earnings per share | $ | 466,295 |  |  | $ | 369,526 |  |  | $ | 684,948 |  |  | $ | 584,252 |
Weighted-average common shares outstanding | 211,673 |  |  | 215,085 |  |  | 212,139 |  |  | 214,978 |
Dilutive effect of stock-based awards and stock options | 836 |  |  | 977 |  |  | 940 |  |  | 966 |
Diluted weighted-average shares outstanding | 212,509 |  |  | 216,062 |  |  | 213,079 |  |  | 215,944 |
Basic earnings per share | $ | 2.20 |  |  | $ | 1.72 |  |  | $ | 3.23 |  |  | $ | 2.72 |
Diluted earnings per share | $ | 2.19 |  |  | $ | 1.71 |  |  | $ | 3.21 |  |  | $ | 2.71 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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