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Dispositions and Assets Held for Sale (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
property
shopping_center
Mar. 31, 2018
USD ($)
land_parcel
shopping_center
Dec. 31, 2018
property
Schedule of Acquisitions and Dispositions [Line Items]      
Gain on sale $ 7,602 $ 11,448  
Disposed of by Sale      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of shopping centers sold | shopping_center 3 6  
Proceeds from sale of property $ 44,900 $ 104,200  
Gain on sale 7,300 $ 11,400  
Number of outparcels sold | land_parcel   1  
Provisions of impairment   $ 200  
Disposed of by Sale | Previously Disposed Assets      
Schedule of Acquisitions and Dispositions [Line Items]      
Proceeds from sale of property $ 300    
Held-for-sale      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of real estate properties | property 1   1
Number of real estate partial properties | property 1