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Earnings Per Share | 9 Months Ended
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Sep. 30, 2016
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Net income for basic and diluted earnings per share | $ | 693,257 |  |  | $ | 228,787 |  |  | $ | 1,022,302 |  |  | $ | 458,984 |
Weighted-average common shares outstanding | 214,819 |  |  | 219,963 |  |  | 215,663 |  |  | 219,835 |
Dilutive effect of stock options, performance share awards and restricted stock awards | 848 |  |  | 1,174 |  |  | 912 |  |  | 1,144 |
Diluted weighted-average shares outstanding | 215,667 |  |  | 221,137 |  |  | 216,575 |  |  | 220,979 |
Basic earnings per share | $ | 3.23 |  |  | $ | 1.04 |  |  | $ | 4.74 |  |  | $ | 2.09 |
Diluted earnings per share | $ | 3.21 |  |  | $ | 1.03 |  |  | $ | 4.72 |  |  | $ | 2.08 |
There were no antidilutive shares for the quarters and nine month periods ended September 30, 2016 and September 30, 2015.

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