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Earnings Per Share | 3 Months Ended
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Mar. 31, 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 March 31,
| 2018 |  | 2017
Net income for basic and diluted earnings per share | $ | 218,653 |  |  | $ | 214,726 |
Weighted-average common shares outstanding | 212,610 |  |  | 214,870 |
Dilutive effect of stock-based awards and stock options | 992 |  |  | 943 |
Diluted weighted-average shares outstanding | 213,602 |  |  | 215,813 |
Basic earnings per share | $ | 1.03 |  |  | $ | 1.00 |
Diluted earnings per share | $ | 1.02 |  |  | $ | 0.99 |
There were no antidilutive shares for the quarters ended March 31, 2018 and March 31, 2017.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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