Summary Of Significant Accounting Policies (Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Total interest costs incurred	$ 190,409	$ 155,659	$ 150,324
Interest capitalized	(22,600)	(18,670)	(22,626)
Interest expense	167,809	136,989	127,698
Cash paid for interest, net of amounts capitalized	158,796	130,912	123,585
Cash paid for income taxes	284	624	386
NON-CASH INVESTING AND FINANCING TRANSACTIONS:
DownREIT operating partnership units redeemed for common shares	883	1,385	7,545
Shares issued under dividend reinvestment plan	1,704	1,718	1,727
Redemption of Series 1 Preferred Shares for common shares	$ 0	$ 175	$ 0