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Acquisitions (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 09, 2020
USD ($)
a
Jan. 13, 2020
USD ($)
a
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 400   $ 0 $ 382
Cameron Village [Member]        
Area of Land | a   4.9    
Payments to Acquire Land   $ 18,200    
Number of Units in Real Estate Property   355    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Area of Land | a 4.7      
Proceeds from Sale of Land Held-for-investment $ 800