Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Common Stock, Shares, Outstanding	46,069,761		46,069,761			47,349,778
Stockholders' Equity Attributable to Parent	$ 2,871,185	$ 1,741,622	$ 2,871,185	$ 1,741,622	$ 2,965,439	$ 3,018,449	$ 1,715,371	$ 1,702,685
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	$ (3,196)	$ (3,116)	$ (3,196)	$ (3,116)	(3,179)	(3,146)	(3,080)	(3,066)
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.51	$ 0.48	$ 1.02	$ 0.96
Stockholders' Equity Attributable to Parent	$ 833,857	$ 763,596	$ 833,857	$ 763,596	795,651	766,716	741,883	716,024
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	3,196	3,116	3,196	3,116	3,179	3,146	3,080	3,066
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	(109,464)	29,567	(109,464)	29,567	(78,202)	2,183	27,157	40,695
Common Stock [Member]
Stockholders' Equity Attributable to Parent	459	329	459	329	472	472	329	328
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 2,146,333	$ 948,130	$ 2,146,333	$ 948,130	$ 2,247,518	$ 2,249,078	$ 946,002	$ 945,638
Common Class A [Member]
Common Stock, Shares, Outstanding	46,069,761	33,037,859	46,069,761	33,037,859	47,377,125	47,349,778	33,024,882	32,965,692