Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]
Balance at Dec. 31, 2022	$ 2,481,577	$ 629,319	$ 2,932,959	$ 31,620	$ (41,743)	$ (1,086,864)	$ 16,286
Net income	373,716			367,837			5,879
Other comprehensive income (loss)	(106,670)					(106,670)
Distributions to non-controlling interest	(4,250)						(4,250)
Purchase of treasury stock	(56,541)				(56,541)
Sale of non-controlling interest of subsidiary	0		54				(54)
Stock Issued During Period RSAs and SARs	0		(21,396)		21,396
Stock-based compensation	12,594		12,594
Cash dividends per share, Common Stock, Cash	(101,160)			(101,160)
Balance at Sep. 30, 2023	$ 2,599,266	629,319	2,924,211	298,297	(76,888)	(1,193,534)	17,861
Common Stock, Dividends, Per Share, Cash Paid	$ 0.771
Balance at Jun. 30, 2023	$ 2,685,228	629,319	2,921,365	211,358	(58,389)	(1,036,295)	17,870
Net income	122,700			120,596			2,104
Other comprehensive income (loss)	(157,239)					(157,239)
Distributions to non-controlling interest	(2,105)						(2,105)
Purchase of treasury stock	(19,978)				(19,978)
Sale of non-controlling interest of subsidiary	0		8				(8)
Stock Issued During Period RSAs and SARs	0		(1,479)		1,479
Stock-based compensation	4,317		4,317
Cash dividends per share, Common Stock, Cash	(33,657)			(33,657)
Balance at Sep. 30, 2023	$ 2,599,266	629,319	2,924,211	298,297	(76,888)	(1,193,534)	17,861
Common Stock, Dividends, Per Share, Cash Paid	$ 0.257
Balance at Dec. 31, 2023	$ 2,964,230	655,322	3,162,622	53,183	(35,599)	(891,412)	20,114
Net income	397,157			390,223			6,934
Other comprehensive income (loss)	314,508					314,508
Distributions to non-controlling interest	(5,590)						(5,590)
Purchase of treasury stock	(124,603)				(124,603)
Stock Issued During Period RSAs and SARs	0		(21,053)		21,053
Stock-based compensation	12,731		12,731
Cash dividends per share, Common Stock, Cash	(104,894)			(104,894)
Balance at Sep. 30, 2024	$ 3,453,539	655,322	3,154,300	338,512	(139,149)	(576,904)	21,458
Common Stock, Dividends, Per Share, Cash Paid	$ 0.810
Balance at Jun. 30, 2024	$ 3,158,335	655,322	3,153,107	235,299	(98,176)	(807,817)	20,600
Net income	140,263			138,007			2,256
Other comprehensive income (loss)	230,913					230,913
Distributions to non-controlling interest	(1,398)						(1,398)
Purchase of treasury stock	(44,060)				(44,060)
Stock Issued During Period RSAs and SARs	0		(3,087)		3,087
Stock-based compensation	4,280		4,280
Cash dividends per share, Common Stock, Cash	(34,794)			(34,794)
Balance at Sep. 30, 2024	$ 3,453,539	$ 655,322	$ 3,154,300	$ 338,512	$ (139,149)	$ (576,904)	$ 21,458
Common Stock, Dividends, Per Share, Cash Paid	$ 0.270