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	188,871,000			188,871,000
Dividends declared and paid:
Common stock dividends declared and paid	(197,691,000)		1,455,000	(199,146,000)
Issuance of common stock:
Director compensation	539,000		539,000
Stock purchase plan	160,000		160,000
ATM equity program	29,150,000	7,000	29,143,000
Restricted shares, net of forfeitures		3,000	(3,000)
Stock issuance costs	(558,000)		(558,000)
Amortization of deferred compensation	5,038,000		5,038,000
Amortization of interest rate hedges	1,223,000				1,223,000
Balances at Jun. 30, 2023	4,150,234,000	1,825,000	4,963,808,000	(804,040,000)	(11,359,000)
Balances at Mar. 31, 2023	4,134,872,000	1,822,000	4,948,024,000	(802,999,000)	(11,975,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	98,704,000			98,704,000
Dividends declared and paid:
Common stock dividends declared and paid	(99,014,000)		731,000	(99,745,000)
Issuance of common stock:
Director compensation	270,000		270,000
Stock purchase plan	62,000		62,000
ATM equity program	12,782,000	3,000	12,779,000
Stock issuance costs	(264,000)		(264,000)
Amortization of deferred compensation	2,206,000		2,206,000
Amortization of interest rate hedges	616,000				616,000
Balances at Jun. 30, 2023	4,150,234,000	1,825,000	4,963,808,000	(804,040,000)	(11,359,000)
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	201,037,000			201,037,000
Dividends declared and paid:
Common stock dividends declared and paid	(204,537,000)		1,306,000	(205,843,000)
Issuance of common stock:
Director compensation	639,000		639,000
Stock purchase plan	83,000		83,000
ATM equity program	33,727,000	8,000	33,719,000
Restricted shares, net of forfeitures		4,000	(4,000)
Stock issuance costs	(310,000)		(310,000)
Amortization of deferred compensation	5,584,000		5,584,000
Amortization of interest rate hedges	1,242,000				1,242,000
Balances at Jun. 30, 2024	4,194,922,000	1,838,000	5,012,642,000	(810,689,000)	(8,869,000)
Balances at Mar. 31, 2024	4,174,858,000	1,835,000	4,996,698,000	(814,196,000)	(9,479,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	106,666,000			106,666,000
Dividends declared and paid:
Common stock dividends declared and paid	(102,589,000)		570,000	(103,159,000)
Issuance of common stock:
Director compensation	319,000		319,000
Stock purchase plan	51,000		51,000
ATM equity program	12,802,000	3,000	12,799,000
Stock issuance costs	(132,000)		(132,000)
Amortization of deferred compensation	2,337,000		2,337,000
Amortization of interest rate hedges	610,000				610,000
Balances at Jun. 30, 2024	$ 4,194,922,000	$ 1,838,000	$ 5,012,642,000	$ (810,689,000)	$ (8,869,000)