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
	Mar. 31, 2026	Mar. 31, 2025
Class A common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 149,242	$ 137,284
Weighted shares (denominator) (in shares)	46,188,850	46,188,903
Per-share amount (in dollars per share)	$ 3.23	$ 2.97
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0
Weighted shares (denominator) (in shares)	10,530	14,681
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 1,232	$ 1,133
Weighted shares (denominator) (in shares)	6,100,800	6,100,800
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 150,474	$ 138,417
Weighted shares (denominator) (in shares)	52,300,180	52,304,384
Per-share amount (in dollars per share)	$ 2.88	$ 2.65
Class B common stock
Income available to stockholders (Basic EPS)
Allocated net income (numerator)	$ 1,232	$ 1,133
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 485	$ 446
Income available to stockholders on equivalent shares (Diluted EPS)
Allocated net income (numerator)	$ 1,232	$ 1,133
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 485	$ 446