Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Class A common stock
Income available to stockholders (Basic EPS:)
Allocated net income (numerator)	$ 68,057	$ 72,964
Weighted shares (denominator) (in shares)	46,188,761	46,188,860
Per-share amount (in dollars per share)	$ 1.47	$ 1.58
Dilutive effect of stock-based awards
Allocated net income (numerator)	$ 0	$ 0
Weighted shares (denominator) (in shares)	10,940	26,298
Assumed conversion of Class B shares
Allocated net income (numerator)	$ 562	$ 602
Weighted shares (denominator) (in shares)	6,100,800	6,100,800
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator)	$ 68,619	$ 73,566
Weighted shares (denominator) (in shares)	52,300,501	52,315,958
Per-share amount (in dollars per share)	$ 1.31	$ 1.41
Class B common stock
Income available to stockholders (Basic EPS:)
Allocated net income (numerator)	$ 562	$ 602
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 221	$ 237
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator)	$ 562	$ 602
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 221	$ 237