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, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Land held for development (including pre-development costs, if any) $ 361,928 $ 388,702
Development and construction in progress, including land 613,014 464,110
Total 974,942 852,812
Buildings and improvement 150,100 156,500
Development [Member]    
Property, Plant and Equipment [Line Items]    
Land 84,000 $ 96,600
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Property, Plant and Equipment [Line Items]    
Buildings and improvement 13,900  
Land 38,900  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Development [Member]    
Property, Plant and Equipment [Line Items]    
Buildings and improvement 700  
Land $ 500