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Earnings Per Share | 6 Months Ended
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Jun. 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 June 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 |  | $ | 173,254 |  |  | 46,189,063 |  |  | $ | 3.75 |  |  | $ | 162,561 |  |  | 46,189,042 |  |  | $ | 3.52 |
Dilutive effect of stock-based awards |  | 0 |  |  | 14,544 |  |  | — |  |  | 0 |  |  | 15,457 |  |  | — |
Assumed conversion of Class B shares |  | 1,431 |  |  | 6,100,800 |  |  | — |  |  | 1,342 |  |  | 6,100,800 |  |  | — |
Class A – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders on Class A equivalent shares |  | $ | 174,685 |  |  | 52,304,407 |  |  | $ | 3.34 |  |  | $ | 163,903 |  |  | 52,305,299 |  |  | $ | 3.13 |
Class B – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 1,431 |  |  | 2,542 |  |  | $ | 563 |  |  | $ | 1,342 |  |  | 2,542 |  |  | $ | 528 |
Class B – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 1,430 |  |  | 2,542 |  |  | $ | 563 |  |  | $ | 1,342 |  |  | 2,542 |  |  | $ | 528 |
|  | Six months ended June 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 |  | $ | 310,538 |  |  | 46,188,984 |  |  | $ | 6.72 |  |  | $ | 286,093 |  |  | 46,189,028 |  |  | $ | 6.19 |
Dilutive effect of stock-based awards |  | 0 |  |  | 14,613 |  |  | — |  |  | 0 |  |  | 13,723 |  |  | — |
Assumed conversion of Class B shares |  | 2,564 |  |  | 6,100,800 |  |  | — |  |  | 2,362 |  |  | 6,100,800 |  |  | — |
Class A – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class A stockholders on Class A equivalent shares |  | $ | 313,102 |  |  | 52,304,397 |  |  | $ | 5.99 |  |  | $ | 288,455 |  |  | 52,303,551 |  |  | $ | 5.52 |
Class B – Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 2,564 |  |  | 2,542 |  |  | $ | 1,008 |  |  | $ | 2,362 |  |  | 2,542 |  |  | $ | 929 |
Class B – Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income available to Class B stockholders |  | $ | 2,563 |  |  | 2,542 |  |  | $ | 1,008 |  |  | $ | 2,361 |  |  | 2,542 |  |  | $ | 929 |

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