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, 2021	$ 3,448,324	$ 610,804	$ 2,689,894	$ 92,493	$ (32,973)	$ 77,080	$ 11,026
Net income	366,366			356,771			9,595
Other comprehensive income (loss)	(1,196,424)					(1,196,424)
Distributions to non-controlling interest	(1,108)						(1,108)
Purchase of treasury stock	(163,321)				(163,321)
Stock Issued During Period RSAs and SARs	447		(18,904)		19,351
Stock-based compensation	12,641		12,641
Cash dividends per share, Common Stock, Cash	(95,818)			(95,818)
Balance at Sep. 30, 2022	2,371,107	610,804	2,683,631	353,446	(176,943)	(1,119,344)	19,513
Balance at Jun. 30, 2022	2,675,313	610,804	2,682,161	262,363	(129,588)	(766,894)	16,467
Net income	126,187			122,823			3,364
Other comprehensive income (loss)	(352,450)					(352,450)
Distributions to non-controlling interest	(318)						(318)
Purchase of treasury stock	(50,116)				(50,116)
Stock Issued During Period RSAs and SARs	(1)		(2,762)		2,761
Stock-based compensation	4,232		4,232
Cash dividends per share, Common Stock, Cash	(31,740)			(31,740)
Balance at Sep. 30, 2022	2,371,107	610,804	2,683,631	353,446	(176,943)	(1,119,344)	19,513
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
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