Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Schedule Of Rental Property Improvements) (Details)

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Significant Accounting Policies (Schedule Of Rental Property Improvements) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Land held for development (including pre-development costs, if any) $ 355,199 $ 364,946
Development and construction in progress, including land 794,268 733,560
Total 1,149,467 1,098,506
Buildings and improvement 162,100 160,300
Development [Member]    
Property, Plant and Equipment [Line Items]    
Land 74,300 $ 74,900
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Property, Plant and Equipment [Line Items]    
Buildings and improvement 6,700  
Land $ 27,300