Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Class A common stock
Income available to stockholders (Basic EPS:)
Allocated net income (numerator)	$ 83,623	$ 89,484	$ 231,171	$ 240,830
Weighted shares (denominator) (in shares)	46,189,025	46,189,035	46,188,878	46,188,729
Per-share amount (in dollars per share)	$ 1.81	$ 1.94	$ 5.00	$ 5.21
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares)	6,586	15,410	8,007	18,330
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 690	$ 739	$ 1,908	$ 1,988
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)	$ 84,313	$ 90,223	$ 233,079	$ 242,818
Weighted shares (denominator) (in shares)	52,296,411	52,305,245	52,297,685	52,307,859
Per-share amount (in dollars per share)	$ 1.61	$ 1.72	$ 4.46	$ 4.64
Class B common stock
Income available to stockholders (Basic EPS:)
Allocated net income (numerator)	$ 690	$ 739	$ 1,908	$ 1,988
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 272	$ 291	$ 751	$ 782
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator)	$ 690	$ 739	$ 1,908	$ 1,988
Weighted shares (denominator) (in shares)	2,542	2,542	2,542	2,542
Per-share amount (in dollars per share)	$ 272	$ 291	$ 751	$ 782