Annual report pursuant to Section 13 and 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 ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Land held for development (including pre-development costs, if any) $ 341,496,000 $ 364,946,000
Development and construction in progress, including land 694,768,000 733,560,000
Total 1,036,264,000 1,098,506,000
Buildings and improvement 150,900,000 160,300,000
Development [Member]    
Property, Plant and Equipment [Line Items]    
Land 68,800,000 $ 74,900,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Development [Member]    
Property, Plant and Equipment [Line Items]    
Buildings and improvement 81,300,000  
Land $ 115,500,000