Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Common Stock, Shares, Outstanding	42,627,286		42,627,286			42,500,611
Cash dividends declared per common share (in dollars per share)	$ 0.59	$ 0.57	$ 1.18	$ 1.14
Stockholders' Equity Attributable to Parent	$ 3,074,856	$ 2,919,249	$ 3,074,856	$ 2,919,249	$ 3,033,392	$ 2,993,120	$ 2,884,208	$ 2,895,251
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	(3,459)	(3,353)	(3,459)	(3,353)	(3,524)	(3,383)	(3,403)	(3,298)
Retained Earnings
Stockholders' Equity Attributable to Parent	1,217,959	1,128,182	1,217,959	1,128,182	1,192,008	1,172,724	1,101,061	1,077,488
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	3,459	3,353	3,459	3,353	3,524	3,383	3,403	3,298
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	(58,083)	(114,225)	(58,083)	(114,225)	(70,202)	(90,007)	(119,338)	(114,827)
Common Stock [Member]
Stockholders' Equity Attributable to Parent	424	423	424	423	424	423	422	427
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 1,914,556	$ 1,904,869	$ 1,914,556	$ 1,904,869	$ 1,911,162	$ 1,909,980	$ 1,902,063	$ 1,932,163
Common Class A [Member]
Common Stock, Shares, Outstanding	42,627,286	42,469,867	42,627,286	42,469,867	42,610,271	42,500,611	42,452,457	42,873,187