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Dispositions and Assets Held for Sale (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
shopping_center
land_parcel
property
Sep. 30, 2019
USD ($)
shopping_center
Sep. 30, 2020
USD ($)
land_parcel
shopping_center
property
Sep. 30, 2019
USD ($)
shopping_center
Dec. 31, 2019
property
Schedule of Acquisitions and Dispositions [Line Items]          
Gain on sale     $ 23,218 $ 46,266  
Disposed of by Sale          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of shopping centers sold | shopping_center 3 12 8 18  
Number of partial shopping centers sold | shopping_center 1 1 3 4  
Number of land parcels sold | land_parcel 1   1    
Proceeds from sale of property $ 36,200 $ 144,600 $ 81,900 $ 239,400  
Gain on sale 13,100 25,500 21,300 46,000  
Provisions of impairment 100 8,200 6,000 14,400  
Disposed of by Sale | Previously Disposed Assets          
Schedule of Acquisitions and Dispositions [Line Items]          
Proceeds from sale of property 100 100 1,000 400  
Gain on sale 100 $ 100 1,500 $ 300  
Contingencies received $ 100   $ 500    
Held-for-sale          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of real estate properties | property 0   0   2
Held-for-sale | Partial Properties          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of real estate properties | property         2