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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Class A common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 158,521	$ 129,967	$ 444,614	$ 332,389
Weighted shares (denominator) (in shares)	46,189,059	46,189,037	46,189,038	46,188,962
Per-share amount (in dollars per share)	$ 3.43	$ 2.81	$ 9.63	$ 7.20
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares)	16,655	9,532	11,163	8,893
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 1,309	$ 1,073	$ 3,671	$ 2,744
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)	$ 159,830	$ 131,040	$ 448,285	$ 335,133
Weighted shares (denominator) (in shares)	52,306,514	52,299,369	52,301,001	52,298,655
Per-share amount (in dollars per share)	$ 3.06	$ 2.51	$ 8.57	$ 6.41
Class B common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 1,309	$ 1,073	$ 3,671	$ 2,744
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 515	$ 422	$ 1,444	$ 1,079
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 1,309	$ 1,073	$ 3,670	$ 2,744
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 515	$ 422	$ 1,444	$ 1,079