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 (Loss) Income [Member]	Total
Beginning balance at Dec. 31, 2019	$ 5,396	$ 98,425	$ 1,536,100	$ (595,324)	$ (163,008)
Beginning balance (in shares) at Dec. 31, 2019				11,682,636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings			109,472			$ 109,472
Other comprehensive income (loss)					3,917
Cash dividends paid			(66,057)
Share-based compensation		5,608
Non-vested stock issued upon vesting		(1,352)		$ 1,352
Non-vested stock issued upon vesting (in shares)				(26,515)
Benefit plans		241		$ 833
Benefit plans (in shares)				(16,344)
Other		(13)	(853)	$ (401)
Other (in shares)				7,850
Ending balance at Dec. 31, 2020	5,396	102,909	1,578,662	$ (593,540)	(159,091)
Ending balance (in shares) at Dec. 31, 2020				11,647,627
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings			118,745			118,745
Other comprehensive income (loss)					(15,537)
Cash dividends paid			(66,694)
Share-based compensation		9,573
Non-vested stock issued upon vesting		(1,264)		$ 1,264
Non-vested stock issued upon vesting (in shares)				(24,711)
Benefit plans		338		$ 756
Benefit plans (in shares)				(14,791)
Purchase of treasury stock				$ (42,511)
Purchase of treasury stock (in shares)				492,045
Other		(204)		$ (377)
Other (in shares)				7,379
Ending balance at Dec. 31, 2021	5,396	111,352	1,630,713	$ (634,408)	(174,628)	$ 938,425
Ending balance (in shares) at Dec. 31, 2021				12,107,549		12,107,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings			140,887			$ 140,887
Other comprehensive income (loss)					(26,060)
Cash dividends paid			(68,915)
Share-based compensation		16,138
Non-vested stock issued upon vesting		(3,239)		$ 3,239
Non-vested stock issued upon vesting (in shares)				(61,821)
Benefit plans		560		$ 618
Benefit plans (in shares)				(11,786)
Other		(768)	15	$ (1,302)
Other (in shares)				24,831
Ending balance at Dec. 31, 2022	$ 5,396	$ 124,043	$ 1,702,700	$ (631,853)	$ (200,688)	$ 999,598
Ending balance (in shares) at Dec. 31, 2022				12,058,773		12,058,773