Consolidated Statements Of Equity - USD ($) $ in Thousands	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2019		$ 111,935		$ 2,636,555	$ 1,210,072	$ (77,702)		$ 3,880,860
Net income					284,849			284,849
Dividends declared					(232,571)			(232,571)
Issuance of common stock from private placement		10,831		718,470				729,301
Issuance of common stock from stock purchase contracts		1,168		(1,168)
Issuance of common stock under dividend reinvestment plan		194		16,328				16,522
Repurchase of stock						(4,365)		(4,365)
Equity compensation plan		120		(120)
Exercise of stock options	$ 37		$ 1,552				$ 1,589
Stock-based compensation				8,276	(488)			7,788
Other				(836)		740		(96)
Balance at Dec. 31, 2020		124,285		3,379,057	1,261,862	(81,327)		4,683,877
Net income					431,612			431,612
Dividends declared					(258,650)			(258,650)
Issuance of common stock from stock purchase contracts		64		(64)
Issuance of common stock under dividend reinvestment plan		187		16,612				16,799
Issuance of common stock from forward equity sale agreement		3,350		296,389				299,739
Repurchase of stock						(3,291)		(3,291)
Equity compensation plan		103		(103)
Exercise of stock options		61		4,111				4,172
Stock-based compensation				9,998	(623)			9,375
Other				(186)		1,003		817
Balance at Dec. 31, 2021		128,050		3,705,814	1,434,201	(83,615)		5,184,450
Net income					465,237			465,237
Dividends declared					(288,632)			(288,632)
Dividends of March 1, 2023 declared ($0.287 per share)					(75,808)			(75,808)
Issuance of common stock from stock purchase contracts		4,515		(4,515)
Issuance of common stock under dividend reinvestment plan		184		16,435				16,619
Issuance of common stock from forward equity sale agreement		661		62,379				63,040
Repurchase of stock						(1,192)		(1,192)
Equity compensation plan		41		(41)
Exercise of stock options		35		2,440				2,475
Stock-based compensation				12,094	(667)			11,427
Other				(1,344)		1,114		(230)
Balance at Dec. 31, 2022		$ 133,486		$ 3,793,262	$ 1,534,331	$ (83,693)		$ 5,377,386