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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Class A common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 173,254	$ 162,561	$ 310,538	$ 286,093
Weighted shares (denominator) (in shares)	46,189,063	46,189,042	46,188,984	46,189,028
Per-share amount (in dollars per share)	$ 3.75	$ 3.52	$ 6.72	$ 6.19
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares)	14,544	15,457	14,613	13,723
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 1,431	$ 1,342	$ 2,564	$ 2,362
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)	$ 174,685	$ 163,903	$ 313,102	$ 288,455
Weighted shares (denominator) (in shares)	52,304,407	52,305,299	52,304,397	52,303,551
Per-share amount (in dollars per share)	$ 3.34	$ 3.13	$ 5.99	$ 5.52
Class B common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 1,431	$ 1,342	$ 2,564	$ 2,362
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 563	$ 528	$ 1,008	$ 929
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 1,430	$ 1,342	$ 2,563	$ 2,361
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 563	$ 528	$ 1,008	$ 929