Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Common Stock in Treasury [Member]	Total	Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Additional Paid-in-Capital [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Retained Earnings [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Accumulated Other Comprehensive (Loss) Income [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock in Treasury [Member]	Cumulative Effect Adjustment for ASU Implementation [Member]
Balance at Dec. 31, 2020	$ 497	$ 578,082	$ 749,056	$ 417	$ (140,434)	$ 1,187,618
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	154,885	0	0	154,885
Cash dividends	0	0	(47,738)	0	0	(47,738)
Purchase of treasury shares	0	0	0	0	(21,714)	(21,714)
Net issuance of shares to employee and other stock plans	0	(5,520)	0	0	2,269	(3,251)
Stock-based compensation	0	4,414	0	0	0	4,414
Other comprehensive income (loss)	0	0	0	(23,761)	0	(23,761)
Balance at Dec. 31, 2021	497	576,976	856,203	(23,344)	(159,879)	1,250,453
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	151,995	0	0	151,995
Cash dividends	0	0	(49,765)	0	0	(49,765)
Purchase of treasury shares	0	0	0	0	(14,713)	(14,713)
Net issuance of shares to employee and other stock plans	0	(3,653)	0	0	1,397	(2,256)
Stock-based compensation	0	4,530	0	0	0	4,530
Other comprehensive income (loss)	0	0	0	(166,690)	0	(166,690)
Balance at Dec. 31, 2022	497	577,853	958,433	(190,034)	(173,195)	1,173,554
Balance (ASU 2022-02 [Member]) at Dec. 31, 2022							$ 0	$ 0	$ 502	$ 0	$ 0	$ 502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	118,782	0	0	118,782
Cash dividends	0	0	(55,886)	0	0	(55,886)
Issuance of common stock for acquisition	43	161,680	0	0	0	161,723
Purchase of treasury shares	0	0	0	0	(4,944)	(4,944)
Net issuance of shares to employee and other stock plans	0	(3,692)	0	0	1,450	(2,242)
Stock-based compensation	0	5,102	0	0	0	5,102
Other comprehensive income (loss)	0	0	0	29,100	0	29,100
Balance at Dec. 31, 2023	$ 540	$ 740,943	$ 1,021,831	$ (160,934)	$ (176,689)	$ 1,425,691