Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Common Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2021	$ 1,074,193	$ 26,761	$ 220,820	$ (153,702)	$ (153,236)	$ 1,133,550
Issuance of common stock under stock option plan	782	12	770
Purchase of common stock	(24,949)			(24,949)
Stock-based and deferred compensation	13,735	68	15,612	(1,945)
Net income	147,153					147,153
Other comprehensive income	(14,276)				(14,276)
Cash dividends paid:
Common stock	(30,573)					(30,573)
Ending Balance at Dec. 31, 2022	1,166,065	26,841	237,202	(180,596)	(167,512)	1,250,130
Issuance of common stock under stock option plan	2,875	53	2,822
Stock-based and deferred compensation	3,304	112	7,008	(3,816)
Net income	40,204					40,204
Other comprehensive income	36,910				36,910
Cash dividends paid:
Common stock	(32,868)					(32,868)
Ending Balance at Dec. 31, 2023	1,216,490	27,006	247,032	(184,412)	(130,602)	1,257,466
Issuance of common stock under stock option plan	1,135	27	1,108
Stock-based and deferred compensation	2,125	123	5,639	(3,637)
Net income	50,370					50,370
Other comprehensive income	(66,236)				(66,236)
Cash dividends paid:
Common stock	(33,950)					(33,950)
Ending Balance at Dec. 31, 2024	$ 1,169,934	$ 27,156	$ 253,779	$ (188,049)	$ (196,838)	$ 1,273,886