CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Class B Common Stock	Common Stock Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Common Stock	Retained Earnings Class B Common Stock	Accumulated Other Comprehensive Loss	Treasury Stock - Common Stock Common Stock	Treasury Stock - Common Stock Class B Common Stock
Beginning Balance at Dec. 31, 2020	$ 512,990			$ 10,204	$ 2,860	$ 135,953	$ 544,280			$ (119,053)	$ (60,845)	$ (409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	189,580						189,580
Other comprehensive income, net of tax	18,590									18,590
Dividends declared		$ (7,141)	$ (2,233)					$ (7,141)	$ (2,233)
Ending Balance at Dec. 31, 2021	711,786			10,204	2,860	135,953	724,486			(100,463)	(60,845)	(409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	430,158						430,158
Other comprehensive income, net of tax	15,626									15,626
Dividends declared		(37,354)	(4,828)					(37,354)	(4,828)
Conversion of 1,227,546 shares of Class B Common Stock	0			1,227	1,227
Ending Balance at Dec. 31, 2022	1,115,388			11,431	1,633	135,953	1,112,462			(84,837)	(60,845)	(409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	408,375						408,375
Other comprehensive income, net of tax	80,561									80,561
Dividends declared		$ (150,642)	$ (18,084)					$ (150,642)	$ (18,084)
Ending Balance at Dec. 31, 2023	$ 1,435,598			$ 11,431	$ 1,633	$ 135,953	$ 1,352,111			$ (4,276)	$ (60,845)	$ (409)