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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Class A common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 181,356	$ 158,521	$ 491,894	$ 444,614
Weighted shares (denominator) (in shares)	46,189,068	46,189,059	46,189,012	46,189,038
Per-share amount (in dollars per share)	$ 3.93	$ 3.43	$ 10.65	$ 9.63
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares)	15,731	16,655	14,985	11,163
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 1,497	$ 1,309	$ 4,061	$ 3,671
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)	$ 182,853	$ 159,830	$ 495,955	$ 448,285
Weighted shares (denominator) (in shares)	52,305,599	52,306,514	52,304,797	52,301,001
Per-share amount (in dollars per share)	$ 3.50	$ 3.06	$ 9.48	$ 8.57
Class B common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 1,497	$ 1,309	$ 4,061	$ 3,671
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 589	$ 515	$ 1,597	$ 1,444
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 1,497	$ 1,309	$ 4,060	$ 3,670
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 589	$ 515	$ 1,597	$ 1,444