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Earnings Per Share | 9 Months Ended
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Sep. 30, 2022
Earnings Per Share |
Earnings Per Share | Note 12 — Earnings Per Share ​ Basic earnings per share is calculated by dividing net income by the weighted-average shares of common stock outstanding during each period, excluding non-vested restricted shares. Our diluted earnings per share is based on the weighted-average shares of common stock outstanding during each period plus the maximum dilutive effect of common stock issuable upon exercise of stock options or vesting of restricted stock units. Stock options and unvested restricted stock units are considered common stock equivalents and are only included in the calculation of diluted earnings per common share when their effect is dilutive. ​ The following table sets forth the computation of basic and diluted earnings per common share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(Dollars and shares in thousands, except for per share amounts) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Basic earnings per common share: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Net income | ​ | $ | 133,043 | ​ | $ | 122,788 | ​ | $ | 352,547 | ​ | $ | 368,697 | ​
Weighted-average basic common shares | ​ | ​ | 75,606 | ​ | ​ | 70,066 | ​ | ​ | 74,185 | ​ | ​ | 70,643 | ​
Basic earnings per common share | ​ | $ | 1.76 | ​ | $ | 1.75 | ​ | $ | 4.75 | ​ | $ | 5.22 | ​
Diluted earnings per common share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 133,043 | ​ | $ | 122,788 | ​ | $ | 352,547 | ​ | $ | 368,697 | ​
Weighted-average basic common shares | ​ | ​ | 75,606 | ​ | ​ | 70,066 | ​ | ​ | 74,185 | ​ | ​ | 70,643 | ​
Effect of dilutive securities | ​ | ​ | 576 | ​ | ​ | 510 | ​ | ​ | 606 | ​ | ​ | 465 | ​
Weighted-average dilutive shares | ​ | ​ | 76,182 | ​ | ​ | 70,576 | ​ | ​ | 74,791 | ​ | ​ | 71,108 | ​
Diluted earnings per common share | ​ | $ | 1.75 | ​ | $ | 1.74 | ​ | $ | 4.71 | ​ | $ | 5.19 | ​
​ The calculation of diluted earnings per common share excludes outstanding stock options for which the results would have been anti-dilutive under the treasury stock method as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
(Dollars in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Number of shares | ​ | ​ | ​ | ​ | ​ | 57,169 | ​ | ​ | ​ | ​ | ​ | 57,169 | ​ | ​ | ​ |  | ​ | 57,169 | ​ | ​ | ​ | ​ | ​ | 60,546 | ​
Range of exercise prices | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​
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