CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Unaudited) - 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	53,363						53,363
Other comprehensive income, net of tax	1,332									1,332
Cash dividends paid: Common Stock		$ (1,785)	$ (558)					$ (1,785)	$ (558)
Ending Balance at Apr. 02, 2021	565,342			10,204	2,860	135,953	595,300			(117,721)	(60,845)	(409)
Beginning 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	93,390						93,390
Other comprehensive income, net of tax	815									815
Cash dividends paid: Common Stock		$ (1,786)	$ (558)					$ (1,786)	$ (558)
Conversion of 1,227,546 shares of Class B Common Stock	0			1,227	(1,227)
Ending Balance at Apr. 01, 2022	$ 803,647			$ 11,431	$ 1,633	$ 135,953	$ 815,532			$ (99,648)	$ (60,845)	$ (409)