Summary Of Significant Accounting Policies (Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Total interest costs incurred		$ 150,324	$ 159,718	$ 130,110
Interest capitalized		22,626	23,429	20,487
Interest expense		127,698	136,289	109,623
Cash paid for interest, net of amounts capitalized		123,585	130,248	106,180
Cash paid for income taxes		386	580	483
NON-CASH INVESTING AND FINANCING TRANSACTIONS:
DownREIT operating partnership units issued with acquisition		0	18,920	0
Mortgage loans assumed with acquisition	[1]	0	8,903	98,041
DownREIT operating partnership units redeemed for common shares		7,545	0	14,105
Settlement of partner loan via dilution		0	0	5,379
Shares issued under dividend reinvestment plan		$ 1,727	$ 1,734	$ 1,784

[1] See our Annual Report on Form 10-K for the year ended December 31, 2020 for additional disclosures relating to the mortgages entered into and assumed as a result of the Hoboken acquisition