Consolidated Statement of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Shares pursuant to dividend reinvestment plan	13,227	61,861
Shares due to exercise of employee stock options and issuance of directors' deferred stock	699	8,007
Limited Partner
Issuance of partnership units pursuant to dividend reinvestment plan (in shares)		13,704
Dividend Distributions Payable
Distributions payable common stock, per share (in usd per share)	$ 0.59	$ 0.57
Distributions partnership units, per unit (in usd per share)	0.59	0.57
Series D Cumulative Redeemable Preferred Stock | Dividend Distributions Payable
Distributions payable on preferred stock, per share (in usd per share)	38.28	38.28
Series E Cumulative Redeemable Preferred Stock | Dividend Distributions Payable
Distributions payable on preferred stock, per share (in usd per share)	$ 37.50	$ 37.50