CONSOLIDATED STATEMENTS OF EQUITY - USD ($)	Total	Series E Preferred Stock	Series F Preferred Stock	Total Stockholders’ Equity	Total Stockholders’ Equity Series E Preferred Stock	Total Stockholders’ Equity Series F Preferred Stock	Preferred Stock Series E Preferred Stock	Preferred Stock Series F Preferred Stock	Common Stock	Capital in Excess of Par Value	Capital in Excess of Par Value Series E Preferred Stock	Capital in Excess of Par Value Series F Preferred Stock	Accumulated Deficit	Accumulated Deficit Series E Preferred Stock	Accumulated Deficit Series F Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Dec. 31, 2018	$ 4,154,605,000			$ 4,154,250,000			$ 287,500,000	$ 345,000,000	$ 1,616,000	$ 3,950,055,000			$ (424,225,000)			$ (5,696,000)	$ 355,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	299,608,000			299,180,000									299,180,000				428,000
Dividends declared and paid:
Preferred stock dividends declared and paid		$ (13,201,000)	$ (17,940,000)		$ (13,201,000)	$ (17,940,000)								$ (13,201,000)	$ (17,940,000)
Common stock dividends declared and paid	(314,619,000)			(314,619,000)					4,000	19,069,000			(333,692,000)
Redemption of depositary shares		$ (287,500,000)			$ (287,500,000)		(287,500,000)				$ (9,856,000)			$ (9,856,000)
Issuance of common stock:
Director compensation	1,294,000			1,294,000						1,294,000
Stock purchase plan	370,000			370,000						370,000
ATM equity program	127,337,000			127,337,000					24,000	127,313,000
Equity offering	395,500,000			395,500,000					70,000	395,430,000
Restricted shares - net of forfeitures and repurchases									4,000	(4,000)
Stock issuance costs	(17,521,000)			(17,521,000)						(17,521,000)
Amortization of deferred compensation	9,452,000			9,452,000						9,452,000
Amortization of interest rate hedges	1,307,000			1,307,000												1,307,000
Fair value of forward starting swaps	(5,524,000)			(5,524,000)												(5,524,000)
Valuation adjustments – available-for-sale securities	116,000			116,000												116,000
Realized gain – available-for-sale securities	(1,331,000)			(1,331,000)												(1,331,000)
Other	505,000			505,000									505,000
Distributions to noncontrolling interests	(776,000)																(776,000)
Ending balance at Dec. 31, 2019	4,331,682,000			4,331,675,000			$ 0	345,000,000	1,718,000	4,495,314,000			(499,229,000)			(11,128,000)	7,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	228,796,000			228,799,000									228,799,000				(3,000)
Dividends declared and paid:
Preferred stock dividends declared and paid			(17,940,000)			(17,940,000)									(17,940,000)
Common stock dividends declared and paid	(351,544,000)			(351,544,000)					1,000	4,864,000			(356,409,000)
Issuance of common stock:
Director compensation	1,132,000			1,132,000						1,132,000
Stock purchase plan	308,000			308,000						308,000
ATM equity program	121,315,000			121,315,000					31,000	121,284,000
Restricted shares - net of forfeitures and repurchases									3,000	(3,000)
Stock issuance costs	(2,212,000)			(2,212,000)						(2,212,000)
Amortization of deferred compensation	13,084,000			13,084,000						13,084,000
Amortization of interest rate hedges	2,300,000			2,300,000												2,300,000
Fair value of forward starting swaps	(7,617,000)			(7,617,000)												(7,617,000)
Realized gain – available-for-sale securities	0
Ending balance at Dec. 31, 2020	4,319,304,000			4,319,300,000				345,000,000	1,753,000	4,633,771,000			(644,779,000)			(16,445,000)	4,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	290,110,000			290,113,000									290,113,000				(3,000)
Dividends declared and paid:
Preferred stock dividends declared and paid	(14,999,000)			(14,999,000)									14,999,000
Common stock dividends declared and paid	(364,792,000)			(364,792,000)						2,499,000			(367,291,000)
Redemption of depositary shares			$ (345,000,000)			$ (345,000,000)		(345,000,000)				$ 10,897,000			$ (10,897,000)
Issuance of common stock:
Director compensation	1,145,000			1,145,000						1,145,000
Stock purchase plan	320,000			320,000						320,000
ATM equity program	1,234,000			1,234,000					1,000	1,233,000
Restricted shares - net of forfeitures and repurchases									3,000	(3,000)
Stock issuance costs	(299,000)			(299,000)						(299,000)
Amortization of deferred compensation	13,151,000			13,151,000						13,151,000
Amortization of interest rate hedges	3,073,000			3,073,000												3,073,000
Fair value of forward starting swaps	(1,584,000)			(1,584,000)												(1,584,000)
Realized gain – available-for-sale securities	0
Ending balance at Dec. 31, 2021	$ 3,901,663,000			$ 3,901,662,000				$ 0	$ 1,757,000	$ 4,662,714,000			$ (747,853,000)			$ (14,956,000)	$ 1,000