Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]
Balance at Dec. 31, 2020	$ 3,399,972	$ 589,352	$ 2,436,288	$ 73,000	$ (32,970)	$ 331,377	$ 2,925
Net income	299,478			293,298			6,180
Other comprehensive income (loss)	(110,987)					(110,987)
Distributions to non-controlling interest	(895)						(895)
Purchase of treasury stock	(39,887)				(39,887)
Stock Issued During Period RSAs and SARs	(15)		(19,854)		19,839
Stock-based compensation	7,723		7,723
Cash dividends per share, Common Stock, Cash	(61,559)			(61,559)
Balance at Jun. 30, 2021	3,493,830	589,352	2,424,157	304,739	(53,018)	220,390	8,210
Balance at Mar. 31, 2021	3,317,385	589,352	2,420,393	173,173	(39,080)	168,752	4,795
Net income	166,249			162,326			3,923
Other comprehensive income (loss)	51,638					51,638
Distributions to non-controlling interest	(508)						(508)
Purchase of treasury stock	(13,964)				(13,964)
Stock Issued During Period RSAs and SARs	0		(26)		26
Stock-based compensation	3,790		3,790
Cash dividends per share, Common Stock, Cash	(30,760)			(30,760)
Balance at Jun. 30, 2021	3,493,830	589,352	2,424,157	304,739	(53,018)	220,390	8,210
Balance at Dec. 31, 2021	3,448,324	610,804	2,689,894	92,493	(32,973)	77,080	11,026
Net income	240,179			233,948			6,231
Other comprehensive income (loss)	(843,974)					(843,974)
Distributions to non-controlling interest	(790)						(790)
Purchase of treasury stock	(113,205)				(113,205)
Stock Issued During Period RSAs and SARs	448		(16,142)		16,590
Stock-based compensation	8,409		8,409
Cash dividends per share, Common Stock, Cash	(64,078)			(64,078)
Balance at Jun. 30, 2022	2,675,313	610,804	2,682,161	262,363	(129,588)	(766,894)	16,467
Balance at Mar. 31, 2022	2,973,402	610,804	2,678,025	178,504	(72,293)	(434,400)	12,762
Net income	120,153			115,794			4,359
Other comprehensive income (loss)	(332,494)					(332,494)
Distributions to non-controlling interest	(654)						(654)
Purchase of treasury stock	(57,350)				(57,350)
Stock Issued During Period RSAs and SARs	0		(55)		55
Stock-based compensation	4,191		4,191
Cash dividends per share, Common Stock, Cash	(31,935)			(31,935)
Balance at Jun. 30, 2022	$ 2,675,313	$ 610,804	$ 2,682,161	$ 262,363	$ (129,588)	$ (766,894)	$ 16,467