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Discontinued Operations and Assets Held for Sale (Narrative) (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
land_parcel
shopping_center
Sep. 30, 2014
USD ($)
Dec. 31, 2014
shopping_center
Schedule of Acquisitions and Dispositions [Line Items]      
Number of shopping centers sold 4    
Number of outparcels sold | land_parcel 2    
Proceeds from sale | $ $ 41,800    
Gain on sale | $ 9,224 $ 16,624  
Provisions of impairment | $ $ 800    
Discontinued Operations [Member]      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of shopping centers sold     34
Discontinued Operations [Member] | Blackstone Advisory Partners L.P. [Member]      
Schedule of Acquisitions and Dispositions [Line Items]      
Number of shopping centers sold     33