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
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Land held for development (including pre-development costs, if any) $ 424,251 $ 465,930
Development and construction in progress, including land 362,442 327,039
Total 786,693 792,969
Buildings and improvement 163,700 204,900
Development [Member]    
Property, Plant and Equipment [Line Items]    
Land $ 71,200 $ 49,600