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	425,232			415,859			9,373
Other comprehensive income (loss)	(172,211)					(172,211)
Distributions to non-controlling interest	(1,088)						(1,088)
Purchase of treasury stock	(80,052)				(80,052)
Sale of non-controlling interest of subsidiary	0		659				(659)
Stock Issued During Period RSAs and SARs	(16)		(20,991)		20,975
Stock-based compensation	11,588		11,588
Cash dividends per share, Common Stock, Cash	(92,204)			(92,204)
Balance at Sep. 30, 2021	3,491,221	589,352	2,427,544	396,655	(92,047)	159,166	10,551
Balance at Jun. 30, 2021	3,493,830	589,352	2,424,157	304,739	(53,018)	220,390	8,210
Net income	125,754			122,561			3,193
Other comprehensive income (loss)	(61,224)					(61,224)
Distributions to non-controlling interest	(193)						(193)
Purchase of treasury stock	(40,165)				(40,165)
Sale of non-controlling interest of subsidiary	0		659				(659)
Stock Issued During Period RSAs and SARs	(1)		(1,137)		1,136
Stock-based compensation	3,865		3,865
Cash dividends per share, Common Stock, Cash	(30,645)			(30,645)
Balance at Sep. 30, 2021	3,491,221	589,352	2,427,544	396,655	(92,047)	159,166	10,551
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