Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Supplemental Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Total interest costs incurred	$ 44,606	$ 36,188
Interest capitalized	(5,381)	(4,615)
Interest expense	39,225	31,573
Cash paid for interest, net of amounts capitalized	37,136	30,436
Cash paid for income taxes	0	4
DownREIT operating partnership units redeemed for common shares	668	977
Shares issued under dividend reinvestment plan	$ 429	$ 432