CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Earnings Reinvested in the Business [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2023	$ 5,396	$ 115,941	$ 1,726,872	$ (622,768)	$ (172,117)	$ 1,053,324
Beginning balance (in shares) at Dec. 31, 2023				11,885,398
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	30,940	$ 0	0	30,940
Other comprehensive income (loss)	0	0	0	0	(3,611)	(3,611)
Cash dividends paid	0	0	(17,312)	0	0	(17,312)
Share-based compensation	0	1,995	0	0	0	1,995
Non-vested stock issued upon vesting	0	(5,365)	0	$ 5,365	0	0
Non-vested stock issued upon vesting (in shares)				(102,396)
Benefit plans	0	299	0	$ 1,122	0	1,421
Benefit plans (in shares)				(21,405)
Other	0	(481)	0	$ (2,340)	0	(2,821)
Other (in shares)				44,652
Ending balance at Mar. 31, 2024	5,396	112,389	1,740,500	$ (618,621)	(175,728)	1,063,936
Ending balance (in shares) at Mar. 31, 2024				11,806,249
Beginning balance at Dec. 31, 2024	5,396	117,500	1,782,139	$ (617,210)	(226,839)	1,060,986
Beginning balance (in shares) at Dec. 31, 2024				11,779,321
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	34,462	$ 0	0	34,462
Other comprehensive income (loss)	0	0	0	0	14,965	14,965
Cash dividends paid	0	0	(17,376)	0	0	(17,376)
Share-based compensation	0	2,900	0	0	0	2,900
Non-vested stock issued upon vesting	0	(3,973)	0	$ 3,973	0	0
Non-vested stock issued upon vesting (in shares)				(75,829)
Benefit plans	0	394	0	$ 1,043	0	1,437
Benefit plans (in shares)				(19,899)
Other	0	(704)	0	$ (1,636)	0	(2,340)
Other (in shares)				31,216
Ending balance at Mar. 31, 2025	$ 5,396	$ 116,117	$ 1,799,225	$ (613,830)	$ (211,874)	$ 1,095,034
Ending balance (in shares) at Mar. 31, 2025				11,714,809