Consolidated Statements Of Equity - USD ($) $ in Thousands	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2022	$ 133,486	$ 3,793,262	$ 1,534,331	$ (83,693)	$ 5,377,386
Net income			191,434		191,434
Dividends declared and paid			(1)		(1)
Dividends declared			(75,876)		(75,876)
Issuance of common stock under dividend reinvestment plan	49	4,068			4,117
Issuance of common stock from at-the-market sale agreements	200	19,094			19,294
Repurchase of stock				(3,911)	(3,911)
Equity compensation plan	111	(111)
Exercise of stock options	2	101			103
Stock-based compensation		3,410	(267)		3,143
Other		(20)		273	253
Balance at Mar. 31, 2023	133,848	3,819,804	1,649,621	(87,331)	5,515,942
Balance at Dec. 31, 2023	138,297	4,137,696	1,706,675	(86,485)	5,896,183
Net income			265,772		265,772
Dividends declared and paid			(1)		(1)
Dividends declared			(83,998)		(83,998)
Issuance of common stock under dividend reinvestment plan	59	3,823			3,882
Repurchase of stock				(2,231)	(2,231)
Equity compensation plan	80	(80)
Exercise of stock options	2	173			175
Stock-based compensation		1,049	73		1,122
Other		(51)		274	223
Balance at Mar. 31, 2024	$ 138,438	$ 4,142,610	$ 1,888,521	$ (88,442)	$ 6,081,127