CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Class A Common Stock	Common Stock Common Stock	Common Stock Class A Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2019				29,431,000	2,054,000
Beginning balance at Dec. 31, 2019				$ 29,431	$ 2,054	$ (158,102)	$ 93,208	$ 295,999	$ (2,087)
Beginning balance (in shares) at Dec. 31, 2019						(12,372,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock (in shares)				58,000
Conversion of Class A Common Stock				$ 58
Stock compensation transactions, net (in shares)				111,000
Stock compensation transactions, net				$ 111
Conversion to Common Stock (in shares)					(58,000)
Conversion to Common Stock					$ (58)
Directors' compensation plan (in shares)						21,000
Directors’ Compensation Plan						$ 265	330
Purchases (in shares)						(1,033,000)
Purchases						$ (19,708)
Stock option and restricted stock issuances							(1,063)
Stock-based compensation							4,375
Net income	$ 59,148							59,148
Cash dividends per share: Common Stock: 2022 – $2.09; 2021 - $2.97; and 2020 – $2.77 Class A Common Stock: 2022 - $1.96; 2021 - $2.79; and 2020– $2.62		$ (46,564)	$ (3,957)					(50,521)
Pension liabilities adjustment, net of taxes	(473)								(473)
Ending balance (in shares) at Dec. 31, 2020				29,600,000	1,996,000
Ending balance (in shares) at Dec. 31, 2020			522,000			(13,384,000)
Ending balance at Dec. 31, 2020	252,967			$ 29,600	$ 1,996	$ (177,545)	96,850	304,626	(2,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock (in shares)				187,000
Conversion of Class A Common Stock				$ 187
Stock compensation transactions, net (in shares)				120,000
Stock compensation transactions, net				$ 120
Conversion to Common Stock (in shares)					(187,000)
Conversion to Common Stock					$ (187)
Directors' compensation plan (in shares)						25,000
Directors’ Compensation Plan						$ 346	523
Purchases (in shares)						(1,232,000)
Purchases						$ (41,809)
Stock option and restricted stock issuances							(3,014)
Stock-based compensation							8,213
Net income	90,803							90,803
Cash dividends per share: Common Stock: 2022 – $2.09; 2021 - $2.97; and 2020 – $2.77 Class A Common Stock: 2022 - $1.96; 2021 - $2.79; and 2020– $2.62		$ (48,837)	$ (3,609)					(52,446)
Pension liabilities adjustment, net of taxes	267								267
Ending balance (in shares) at Dec. 31, 2021				29,907,000	1,809,000
Ending balance (in shares) at Dec. 31, 2021		14,069,000	522,000			(14,591,000)
Ending balance at Dec. 31, 2021	255,970			$ 29,907	$ 1,809	$ (219,008)	102,572	342,983	(2,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock (in shares)				3,000
Conversion of Class A Common Stock				$ 3
Stock compensation transactions, net (in shares)				96,000
Stock compensation transactions, net				$ 96
Conversion to Common Stock (in shares)					(3,000)
Conversion to Common Stock					$ (3)
Directors' compensation plan (in shares)						16,000
Directors’ Compensation Plan						$ 250	707
Purchases (in shares)						(1,087,000)
Purchases						$ (29,998)
Stock option and restricted stock issuances							(1,768)
Stock-based compensation							7,195
Net income	89,358							89,358
Cash dividends per share: Common Stock: 2022 – $2.09; 2021 - $2.97; and 2020 – $2.77 Class A Common Stock: 2022 - $1.96; 2021 - $2.79; and 2020– $2.62		$ (31,432)	$ (2,516)					(33,948)
Pension liabilities adjustment, net of taxes	1,537								1,537
Ending balance (in shares) at Dec. 31, 2022				30,006,000	1,806,000
Ending balance (in shares) at Dec. 31, 2022		15,140,000	522,000			(15,662,000)
Ending balance at Dec. 31, 2022	$ 289,399			$ 30,006	$ 1,806	$ (248,756)	$ 108,706	$ 398,393	$ (756)