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Dispositions and Assets Held for Sale (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
land_parcel
property
shopping_center
Dec. 31, 2019
USD ($)
shopping_center
property
Dec. 31, 2018
USD ($)
Schedule of Acquisitions and Dispositions [Line Items]      
Gain on sale $ 34,499 $ 54,767 $ 209,168
Disposed of by Sale      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of shopping centers sold | shopping_center 10 24  
Number of partial shopping centers sold | shopping_center 6 3  
Number of land parcels sold | land_parcel 1    
Proceeds from sale of property $ 121,400 $ 288,500  
Gain on sale 32,600 53,400  
Provisions of impairment 8,000 16,400  
Disposed of by Sale | Previously Disposed Assets      
Schedule of Acquisitions and Dispositions [Line Items]      
Proceeds from sale of property 1,000 1,600  
Contingencies received 500    
Gain on sale $ 1,500 $ 1,400  
Held-for-sale      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of real estate properties | property 2 2  
Number of real estate partial properties | property 1