Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Common Stock, Shares, Outstanding	42,469,867		42,469,867			42,873,187
Stockholders' Equity Attributable to Parent	$ 2,919,249	$ 2,854,914	$ 2,919,249	$ 2,854,914	$ 2,884,208	$ 2,895,251	$ 2,830,909	$ 2,886,701
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	$ (3,353)	$ (3,289)	$ (3,353)	$ (3,289)	(3,403)	(3,298)	(3,286)	(3,227)
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.57	$ 0.55	$ 1.14	$ 1.10
Stockholders' Equity Attributable to Parent	$ 1,128,182	$ 1,009,735	$ 1,128,182	$ 1,009,735	1,101,061	1,077,488	971,338	934,442
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	3,353	3,289	3,353	3,289	3,403	3,298	3,286	3,227
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	(114,225)	(152,935)	(114,225)	(152,935)	(119,338)	(114,827)	(135,945)	(163,084)
Common Stock [Member]
Stockholders' Equity Attributable to Parent	423	440	423	440	422	427	439	455
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 1,904,869	$ 1,997,674	$ 1,904,869	$ 1,997,674	$ 1,902,063	$ 1,932,163	$ 1,995,077	$ 2,114,888
Common Class A [Member]
Common Stock, Shares, Outstanding	42,469,867	44,130,901	42,469,867	44,130,901	42,452,457	42,873,187	44,114,827	45,641,238