Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2021	$ 3,145,424	$ 55,057	$ 1,110,520	$ 2,176,998	$ 126,314	$ (323,465)
Total comprehensive income (loss)	(554,065)			331,509	(885,574)
Dividends	(54,085)			(54,085)
Purchase of treasury stock	(31,806)					(31,806)
Issuances of equity awards, net of forfeitures	679		(6,630)			7,309
Recognition of equity-based compensation	16,062		16,062
Sale of treasury stock	429		257			172
Exercise of stock options	907		280			627
Ending Balance at Sep. 30, 2022	2,523,545	55,057	1,120,489	2,454,422	(759,260)	(347,163)
Beginning Balance at Jun. 30, 2022	2,642,888	55,057	1,115,504	2,384,454	(564,803)	(347,324)
Total comprehensive income (loss)	(106,467)			87,990	(194,457)
Dividends	(18,022)			(18,022)
Recognition of equity-based compensation	4,839		4,839
Sale of treasury stock	144		83			61
Exercise of stock options	163		63			100
Ending Balance at Sep. 30, 2022	2,523,545	55,057	1,120,489	2,454,422	(759,260)	(347,163)
Beginning Balance at Dec. 31, 2022	2,667,093	55,057	1,125,949	2,536,086	(702,735)	(347,264)
Total comprehensive income (loss)	189,465			279,101	(89,636)
Dividends	(55,772)			(55,772)
Purchase of treasury stock	(8,096)					(8,096)
Issuances of equity awards, net of forfeitures	719		(10,115)			10,834
Recognition of equity-based compensation	11,983		11,983
Sale of treasury stock	383		167			216
Exercise of stock options	884		255			629
Ending Balance at Sep. 30, 2023	2,806,659	55,057	1,128,239	2,759,415	(792,371)	(343,681)
Beginning Balance at Jun. 30, 2023	2,831,628	55,057	1,124,977	2,681,448	(685,831)	(344,023)
Total comprehensive income (loss)	(9,986)			96,554	(106,540)
Dividends	(18,587)			(18,587)
Purchase of treasury stock	(194)					(194)
Issuances of equity awards, net of forfeitures			(351)			351
Recognition of equity-based compensation	3,528		3,528
Sale of treasury stock	128		52			76
Exercise of stock options	142		33			109
Ending Balance at Sep. 30, 2023	$ 2,806,659	$ 55,057	$ 1,128,239	$ 2,759,415	$ (792,371)	$ (343,681)