Condensed Consolidated Statements of Equity (Unaudited) - USD ($)	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2022	$ 4,123,502,000	$ 1,815,000	$ 4,928,034,000	$ (793,765,000)	$ (12,582,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	295,658,000			295,658,000
Dividends declared and paid:
Common stock dividends declared and paid	(299,638,000)		(2,155,000)	(301,793,000)
Issuance of common stock:
Director compensation	833,000		833,000
Stock purchase plan	222,000		222,000
ATM equity program	29,150,000	7,000	29,143,000
Restricted shares, net of forfeitures		3,000	(3,000)
Stock issuance costs	(933,000)		(933,000)
Amortization of deferred compensation	7,421,000		7,421,000
Amortization of interest rate hedges	1,843,000				1,843,000
Balances at Sep. 30, 2023	4,158,058,000	1,825,000	4,966,872,000	(799,900,000)	(10,739,000)
Balances at Jun. 30, 2023	4,150,234,000	1,825,000	4,963,808,000	(804,040,000)	(11,359,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	106,787,000			106,787,000
Dividends declared and paid:
Common stock dividends declared and paid	(101,947,000)		700,000	(102,647,000)
Issuance of common stock:
Director compensation	294,000		294,000
Stock purchase plan	62,000		62,000
Stock issuance costs	(375,000)		(375,000)
Amortization of deferred compensation	2,383,000		2,383,000
Amortization of interest rate hedges	620,000				620,000
Balances at Sep. 30, 2023	4,158,058,000	1,825,000	4,966,872,000	(799,900,000)	(10,739,000)
Balances at Dec. 31, 2023	4,157,457,000	1,826,000	4,971,625,000	(805,883,000)	(10,111,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	298,941,000			298,941,000
Dividends declared and paid:
Common stock dividends declared and paid	(309,979,000)		1,941,000	(311,920,000)
Issuance of common stock:
Director compensation	959,000		959,000
Stock purchase plan	132,000		132,000
ATM equity program	214,861,000	47,000	214,814,000
Restricted shares, net of forfeitures		4,000	(4,000)
Stock issuance costs	(3,219,000)		(3,219,000)
Amortization of deferred compensation	8,082,000		8,082,000
Amortization of interest rate hedges	1,692,000				1,692,000
Balances at Sep. 30, 2024	4,368,926,000	1,877,000	5,194,330,000	(818,862,000)	(8,419,000)
Balances at Jun. 30, 2024	4,194,922,000	1,838,000	5,012,642,000	(810,689,000)	(8,869,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	97,904,000			97,904,000
Dividends declared and paid:
Common stock dividends declared and paid			635,000	(106,077,000)
Common stock dividends declared and paid	(105,442,000)
Issuance of common stock:
Director compensation	320,000		320,000
Stock purchase plan	49,000		49,000
ATM equity program	181,134,000	39,000	181,095,000
Stock issuance costs	(2,909,000)		(2,909,000)
Amortization of deferred compensation	2,498,000		2,498,000
Amortization of interest rate hedges	450,000				450,000
Balances at Sep. 30, 2024	$ 4,368,926,000	$ 1,877,000	$ 5,194,330,000	$ (818,862,000)	$ (8,419,000)