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, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Land held for development (including pre-development costs, if any) $ 452,057 $ 465,930
Development and construction in progress, including land 465,779 327,039
Total 917,836 792,969
Buildings and improvement 163,600 204,900
Development [Member]    
Property, Plant and Equipment [Line Items]    
Land $ 108,800 $ 49,600