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Investments in Unconsolidated Joint Ventures - Narrative (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2018
USD ($)
ft²
Jul. 06, 2018
USD ($)
ft²
Feb. 16, 2018
USD ($)
Dec. 14, 2017
USD ($)
Sep. 18, 2017
USD ($)
Mar. 17, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 06, 2018
ft²
Mar. 01, 2018
Schedule of Equity Method Investments [Line Items]                      
Proceeds from sale $ 142,500                    
Outside partner interest of the operating partnership                     75.00%
Proceeds received in disposition of property               $ 36,305 $ 0    
Ownership percentage                     25.00%
Country Club Plaza | Office building                      
Schedule of Equity Method Investments [Line Items]                      
Gain on sale of building           $ 2,290          
Fashion District Philadelphia | Office building                      
Schedule of Equity Method Investments [Line Items]                      
Gain on sale of building     $ 2,773   $ 6,713            
Westcor/Queen Creek LLC | Land                      
Schedule of Equity Method Investments [Line Items]                      
Gain sale of land       $ 5,436              
The Market at Estrella Falls                      
Schedule of Equity Method Investments [Line Items]                      
Gain on sale of building   $ 2,996                  
Joint Venture | Los Angeles Premium Outlets                      
Schedule of Equity Method Investments [Line Items]                      
Property area (in square feet) | ft²                   400  
Ownership percentage                   50.00%  
Joint Venture | Country Club Plaza | Office building                      
Schedule of Equity Method Investments [Line Items]                      
Proceeds from sale of building           78,000          
Gain on sale of building           $ 4,580          
Joint Venture | Fashion District Philadelphia | Office building                      
Schedule of Equity Method Investments [Line Items]                      
Proceeds from sale of building     41,800   61,500            
Gain on sale of building     $ 5,545   $ 13,426            
Joint Venture | Westcor/Queen Creek LLC | Land                      
Schedule of Equity Method Investments [Line Items]                      
Revenues       30,491              
Gain sale of land       $ 14,853              
Joint Venture | The Market at Estrella Falls                      
Schedule of Equity Method Investments [Line Items]                      
Gain on sale of building   $ 12,598                  
Property area (in square feet) | ft²   298                  
Proceeds from sale   $ 49,100                  
Repayments of debt   $ 24,118                  
Joint Venture | Westside Pavilion                      
Schedule of Equity Method Investments [Line Items]                      
Gain on sale of building $ 46,242           $ 46,242 $ 46,242      
Property area (in square feet) | ft² 755                    
Proceeds from sale $ 36,903                    
Outside partner interest of the operating partnership 75.00%                    
Proceeds received in disposition of property $ 142,500                    
Assumption of mortgage notes payable $ 105,597                    
Ownership percentage             75.00% 75.00%