Consolidated Statement of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Shares pursuant to dividend reinvestment plan	10,577,000	57,821,000	61,861	65,171,000		96,268
Shares due to exercise of employee stock options and issuance of directors' deferred stock	3,191,000	19,618,000	8,007	743,000	6,038,000	910
Issuance of partnership units pursuant to dividend reinvestment plan (in shares)				13,841,000
Limited Partner
Shares pursuant to dividend reinvestment plan					68,206,000
Issuance of partnership units pursuant to dividend reinvestment plan (in shares)		12,955,000	13,704		13,978,000	19,493
Twinbrook Metro Station
Number of partnership units issued in transaction (in shares)					469,740,000
Twinbrook Metro Station | Restricted Stock Units (RSUs)
Restricted units released pursuant to first escrow release, shares						1,416,071
Ashbrook Marketplace
Number of partnership units issued in transaction (in shares)					93,674,000
Dividend Distributions Payable
Distributions payable common stock, per share (in usd per share)	$ 0.59	$ 0.59	$ 0.57	$ 0.55	$ 0.55	$ 0.53
Distributions partnership units, per unit (in usd per share)	0.59	0.59	0.57	0.55	0.55	0.53
Series D Cumulative Redeemable Preferred Stock | 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 Preferred Stock | 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