Consolidated Statement of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Shares pursuant to dividend reinvestment plan	14,690,000	15,588,000	13,227	10,577,000		61,861
Shares due to exercise of employee stock options and issuance of directors' deferred stock	895,000	3,104,000	699	3,191,000	19,618,000	8,007
Limited Partner
Shares pursuant to dividend reinvestment plan					57,821,000
Issuance of partnership units pursuant to dividend reinvestment plan (in shares)					12,955,000	13,704
Dividend Distributions Payable
Distributions payable common stock, per share (in usd per share)	$ 0.59	$ 0.59	$ 0.59	$ 0.59	$ 0.59	$ 0.57
Distributions partnership units, per unit (in usd per share)	0.59	0.59	0.59	0.59	0.59	0.57
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | Dividend Distributions Payable
Distributions payable on preferred stock, per share (in usd per share)	38.28	38.28	38.28	38.28	38.28	38.28
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | Dividend Distributions Payable
Distributions payable on preferred stock, per share (in usd per share)	$ 37.50	$ 37.50	$ 37.50	$ 37.50	$ 37.50	$ 37.50