Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Common Stock, Shares, Outstanding	45,634,626		45,634,626			47,349,778
Stockholders' Equity Attributable to Parent	$ 2,817,201	$ 1,755,954	$ 2,817,201	$ 1,755,954	$ 2,871,185	$ 3,018,449	$ 1,741,622	$ 1,702,685
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	$ (3,239)	$ (3,157)	$ (3,239)	$ (3,157)	(3,196)	(3,146)	(3,116)	(3,066)
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.51	$ 0.48	$ 1.53	$ 1.44
Stockholders' Equity Attributable to Parent	$ 882,503	$ 787,742	$ 882,503	$ 787,742	833,857	766,716	763,596	716,024
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	3,239	3,157	3,239	3,157	3,196	3,146	3,116	3,066
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	(179,069)	18,567	(179,069)	18,567	(109,464)	2,183	29,567	40,695
Common Stock [Member]
Stockholders' Equity Attributable to Parent	454	329	454	329	459	472	329	328
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 2,113,313	$ 949,316	$ 2,113,313	$ 949,316	$ 2,146,333	$ 2,249,078	$ 948,130	$ 945,638
Common Class A [Member]
Common Stock, Shares, Outstanding	45,634,626	33,043,812	45,634,626	33,043,812	46,069,761	47,349,778	33,037,859	32,965,692