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	90,167,000			90,167,000
Dividends declared and paid:
Common stock dividends declared and paid	(98,677,000)		724,000	(99,401,000)
Issuance of common stock:
Director compensation	269,000		269,000
Stock purchase plan	98,000		98,000
ATM equity program	16,368,000	4,000	16,364,000
Restricted shares, net of forfeitures		3,000	(3,000)
Stock issuance costs	(294,000)		(294,000)
Amortization of deferred compensation	2,832,000		2,832,000
Amortization of interest rate hedges	607,000				607,000
Balances at Mar. 31, 2023	4,134,872,000	1,822,000	4,948,024,000	(802,999,000)	(11,975,000)
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	94,371,000			94,371,000
Dividends declared and paid:
Common stock dividends declared and paid	(101,948,000)		736,000	(102,684,000)
Issuance of common stock:
Director compensation	320,000		320,000
Stock purchase plan	32,000		32,000
ATM equity program	20,925,000	5,000	20,920,000
Restricted shares, net of forfeitures		4,000	(4,000)
Stock issuance costs	(178,000)		(178,000)
Amortization of deferred compensation	3,247,000		3,247,000
Amortization of interest rate hedges	632,000				632,000
Balances at Mar. 31, 2024	$ 4,174,858,000	$ 1,835,000	$ 4,996,698,000	$ (814,196,000)	$ (9,479,000)