Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Supplemental Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Total interest costs incurred			$ 141,994	$ 112,596
Interest capitalized			(17,159)	(13,889)
Interest expense	$ 42,726	$ 35,060	124,835	98,707
Cash paid for interest, net of amounts capitalized			113,414	94,712
Cash paid for income taxes			778	616
Shares issued under dividend reinvestment plan			1,275	1,292
DownREIT operating partnership units redeemed for common shares			883	1,385
5.417% Series 1 Cumulative Convertible Preferred Shares redeemed for common shares			$ 0	$ 175