| Earnings per share |
The following table reflects the calculation of basic and diluted earnings per share. During each period, certain stock options, as noted below, were excluded from the calculation of diluted earnings per share because their effect would have been antidilutive. | | | | | | | | | | | | | | | | | | | | Quarter Ended
June 30, | | Six Months Ended
June 30, | (dollars and shares in thousands, except per share amounts) | | 2016 | | 2015 | | 2016 | | 2015 | Earnings per share – basic: | | | | | | | | | Net income | | $ | 58,389 |
| | $ | 56,063 |
| | $ | 116,491 |
| | $ | 102,003 |
| Income allocated to participating securities | | (493 | ) | | (376 | ) | | (954 | ) | | (669 | ) | Income available to common shareholders | | $ | 57,896 |
| | $ | 55,687 |
|
| $ | 115,537 |
| | $ | 101,334 |
| Weighted-average shares outstanding | | 48,611 |
| | 49,770 |
| | 48,699 |
| | 49,732 |
| Earnings per share – basic | | $ | 1.19 |
| | $ | 1.12 |
| | $ | 2.37 |
| | $ | 2.04 |
| | | | | | | | | | Earnings per share – diluted: | | |
| | |
| | | | | Net income | | $ | 58,389 |
| | $ | 56,063 |
| | $ | 116,491 |
| | $ | 102,003 |
| Income allocated to participating securities | | (489 | ) | | (374 | ) | | (948 | ) | | (665 | ) | Re-measurement of share-based awards classified as liabilities | | 88 |
| | (132 | ) | | 293 |
| | 47 |
| Income available to common shareholders | | $ | 57,988 |
| | $ | 55,557 |
|
| $ | 115,836 |
| | $ | 101,385 |
| Weighted-average shares outstanding | | 48,611 |
| | 49,770 |
| | 48,699 |
| | 49,732 |
| Dilutive impact of potential common shares | | 429 |
| | 400 |
| | 412 |
| | 404 |
| Weighted-average shares and potential common shares outstanding | | 49,040 |
| | 50,170 |
|
| 49,111 |
| | 50,136 |
| Earnings per share – diluted | | $ | 1.18 |
| | $ | 1.11 |
| | $ | 2.36 |
| | $ | 2.02 |
| Antidilutive options excluded from calculation | | 236 |
| | 260 |
| | 236 |
| | 260 |
|
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