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Dispositions and Assets Held for Sale (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
property
shopping_center
Jun. 30, 2018
USD ($)
shopping_center
Jun. 30, 2019
USD ($)
property
shopping_center
Jun. 30, 2018
USD ($)
land_parcel
shopping_center
Dec. 31, 2018
property
Schedule of Acquisitions and Dispositions [Line Items]          
Gain on sale     $ 20,645 $ 39,710  
Disposed of by Sale          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of shopping centers sold | shopping_center 3 9 6 15  
Number of partial shopping centers sold | shopping_center 3 1 3 1  
Proceeds from sale of property $ 50,000 $ 134,700 $ 94,800 $ 238,900  
Gain on sale $ 13,200 27,800 20,500 $ 39,200  
Number of outparcels sold | land_parcel       1  
Provisions of impairment   $ 700   $ 12,900  
Disposed of by Sale | Previously Disposed Assets          
Schedule of Acquisitions and Dispositions [Line Items]          
Proceeds from sale of property     300 500  
Gain on sale     $ 100 $ 500  
Held-for-sale          
Schedule of Acquisitions and Dispositions [Line Items]          
Number of real estate properties | property 4   4   1