Earnings Per Share - Reconciliation of the Numerators and Denominators Used in the Basic and Diluted Per-Share Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Class A common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 178,818	$ 173,254	$ 328,060	$ 310,538
Weighted shares (denominator) (in shares)	46,189,033	46,189,063	46,188,942	46,188,984
Per-share amount (in dollars per share)	$ 3.87	$ 3.75	$ 7.10	$ 6.72
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares)	8,864	14,544	9,698	14,613
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 1,476	$ 1,431	$ 2,708	$ 2,564
Weighted shares (denominator) (in shares)	6,100,800	6,100,800	6,100,800	6,100,800
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 180,294	$ 174,685	$ 330,768	$ 313,102
Weighted shares (denominator) (in shares)	52,298,697	52,304,407	52,299,440	52,304,397
Per-share amount (in dollars per share)	$ 3.45	$ 3.34	$ 6.32	$ 5.99
Class B common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 1,476	$ 1,431	$ 2,708	$ 2,564
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 581	$ 563	$ 1,065	$ 1,008
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 1,476	$ 1,430	$ 2,708	$ 2,563
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 581	$ 563	$ 1,065	$ 1,008