Variable Interest Entities (Summary Of Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investment in Real Estate Joint Ventures and Partnerships, net	$ 404,495	$ 427,947
Other liabilities, net	209,495	217,770
Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Investment in Real Estate Joint Ventures and Partnerships, net	133,895	128,361
Maximum risk of loss	34,000	34,000
Unconsolidated Variable Interest Entities [Member] | Other Liabilities [Member]
Variable Interest Entity [Line Items]
Other liabilities, net	$ 6,599	$ 7,735