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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
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,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net income for basic and diluted earnings per share | $ | 369,526 |  |  | $ | 229,905 |  |  | $ | 584,252 |  |  | $ | 329,045 |
Weighted-average common shares outstanding | 215,085 |  |  | 215,265 |  |  | 214,978 |  |  | 216,089 |
Dilutive effect of stock options, performance share awards and restricted stock awards | 977 |  |  | 866 |  |  | 966 |  |  | 951 |
Diluted weighted-average shares outstanding | 216,062 |  |  | 216,131 |  |  | 215,944 |  |  | 217,040 |
Basic earnings per share | $ | 1.72 |  |  | $ | 1.07 |  |  | $ | 2.72 |  |  | $ | 1.52 |
Diluted earnings per share | $ | 1.71 |  |  | $ | 1.06 |  |  | $ | 2.71 |  |  | $ | 1.52 |

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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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