Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Supplemental Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Total interest costs incurred			$ 72,824	$ 76,284
Interest capitalized			(9,177)	(13,022)
Interest expense	$ 32,074	$ 31,177	63,647	63,262
Cash paid for interest, net of amounts capitalized			61,973	60,782
Cash paid for income taxes			607	320
DownREIT operating partnership units redeemed for common shares			1,385	5,121
Shares issued under dividend reinvestment plan			866	866
5.417% Series 1 Cumulative Convertible Preferred Shares redeemed for common shares			$ 175	$ 0