Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Supplemental Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounting Policies [Abstract]
Total interest costs incurred			$ 112,596	$ 113,691
Interest capitalized			(13,889)	(18,180)
Interest expense	$ 35,060	$ 32,249	98,707	95,511
Cash paid for interest, net of amounts capitalized			94,712	91,887
Cash paid for income taxes			616	326
DownREIT operating partnership units redeemed for common shares			1,385	5,121
Shares issued under dividend reinvestment plan			1,292	1,294
5.417% Series 1 Cumulative Convertible Preferred Shares redeemed for common shares			$ 175	$ 0