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Dispositions and Assets Held for Sale (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
shopping_center
property
Jun. 30, 2020
USD ($)
shopping_center
Jun. 30, 2021
USD ($)
shopping_center
property
Jun. 30, 2020
USD ($)
shopping_center
Dec. 31, 2020
property
Schedule of Acquisitions and Dispositions [Line Items]          
Gain on sale     $ 38,367 $ 9,597  
Disposed of by Sale          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of shopping centers sold | shopping_center 2 2 6 5  
Number of partial shopping centers sold | shopping_center 5   9 2  
Proceeds from sale of property $ 67,900 $ 5,200 $ 99,700 $ 45,700  
Gain on sale 32,600 $ 700 38,300 8,200  
Provisions of impairment     1,500 100  
Disposed of by Sale | Previously Disposed Assets          
Schedule of Acquisitions and Dispositions [Line Items]          
Proceeds from sale of property 100   100 900  
Gain on sale $ 100   $ 100 1,400  
Contingencies received       $ 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         1