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Earnings Per Share | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Class A and Class B basic earnings per share and Class B diluted earnings per share are calculated under the two-class method. The two-class method allocates earnings to each class of stock based upon its dividend rights. Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1. See Note 11, "Capital Stock". Class A diluted earnings per share is calculated under the if-converted method, which reflects the conversion of Class B shares to Class A shares. Diluted earnings per share calculations include the dilutive effect of assumed issuance of stock-based awards under compensation plans that have the option to be paid in stock using the treasury stock method. A reconciliation of the numerators and denominators used in the basic and diluted per-share computations is presented as follows for each class of common stock:
|  | Three months ended September 30,
|  | 2025 |  | 2024
(dollars in thousands, except per share data) |  | Allocated net income (numerator) |  | Weighted shares (denominator) |  | Per-share amount |  | Allocated net income (numerator) |  | Weighted shares (denominator) |  | Per-share amount
Class A – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders |  | $ | 181,356 |  |  | 46,189,068 |  |  | $ | 3.93 |  |  | $ | 158,521 |  |  | 46,189,059 |  |  | $ | 3.43 |
Dilutive effect of stock-based awards |  | 0 |  |  | 15,731 |  |  | — |  |  | 0 |  |  | 16,655 |  |  | — |
Assumed conversion of Class B shares |  | 1,497 |  |  | 6,100,800 |  |  | — |  |  | 1,309 |  |  | 6,100,800 |  |  | — |
Class A – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders on Class A equivalent shares |  | $ | 182,853 |  |  | 52,305,599 |  |  | $ | 3.50 |  |  | $ | 159,830 |  |  | 52,306,514 |  |  | $ | 3.06 |
Class B – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 1,497 |  |  | 2,542 |  |  | $ | 589 |  |  | $ | 1,309 |  |  | 2,542 |  |  | $ | 515 |
Class B – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 1,497 |  |  | 2,542 |  |  | $ | 589 |  |  | $ | 1,309 |  |  | 2,542 |  |  | $ | 515 |
|  | Nine months ended September 30,
|  | 2025 |  | 2024
(dollars in thousands, except per share data) |  | Allocated net income (numerator) |  | Weighted shares (denominator) |  | Per-share amount |  | Allocated net income (numerator) |  | Weighted shares (denominator) |  | Per-share amount
Class A – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders |  | $ | 491,894 |  |  | 46,189,012 |  |  | $ | 10.65 |  |  | $ | 444,614 |  |  | 46,189,038 |  |  | $ | 9.63 |
Dilutive effect of stock-based awards |  | 0 |  |  | 14,985 |  |  | — |  |  | 0 |  |  | 11,163 |  |  | — |
Assumed conversion of Class B shares |  | 4,061 |  |  | 6,100,800 |  |  | — |  |  | 3,671 |  |  | 6,100,800 |  |  | — |
Class A – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders on Class A equivalent shares |  | $ | 495,955 |  |  | 52,304,797 |  |  | $ | 9.48 |  |  | $ | 448,285 |  |  | 52,301,001 |  |  | $ | 8.57 |
Class B – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 4,061 |  |  | 2,542 |  |  | $ | 1,597 |  |  | $ | 3,671 |  |  | 2,542 |  |  | $ | 1,444 |
Class B – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 4,060 |  |  | 2,542 |  |  | $ | 1,597 |  |  | $ | 3,670 |  |  | 2,542 |  |  | $ | 1,444 |

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