CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period at Dec. 31, 2021	$ 352,116	$ 5,616	$ 1,567	$ 16,331	$ 336,778	$ (8,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	7,541	166		7,375
Conversion of Class B to Class A shares	0	1	(1)
Net income	74,158				74,158
Cash dividends on Class A and Class B common stock	(6,012)				(6,012)
Current period other comprehensive income, net of tax	(1,310)					(1,310)
Pension settlement, net of tax	0
Reclassification adjustment to net income, net of tax	473					473
Balance, end of period at Dec. 31, 2022	426,966	5,783	1,566	23,706	404,924	(9,013)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,157	191		4,966
Purchase of treasury shares	(3,103)	(91)			(3,012)
Net income	(39,587)				(39,587)
Cash dividends on Class A and Class B common stock	(6,452)				(6,452)
Current period other comprehensive income, net of tax	(2,118)					(2,118)
Pension settlement, net of tax	1,398					1,398
Reclassification adjustment to net income, net of tax	79					79
Balance, end of period at Dec. 31, 2023	$ 382,340	$ 5,883	$ 1,566	$ 28,672	$ 355,873	$ (9,654)