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Investments in Unconsolidated Entities - European Investments (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
property
$ / shares
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Investment in Unconsolidated Entities      
Income from unconsolidated entities $ 90,026 $ 69,085  
Klepierre | Disposed by Sales | Shopping centers      
Investment in Unconsolidated Entities      
Gain (loss) on disposition of interest in properties $ 13,400    
European Joint Venture | Designer Outlet properties      
Investment in Unconsolidated Entities      
Number of properties | property 9   9
European Property Management and Development | Designer Outlet properties      
Investment in Unconsolidated Entities      
Ownership interest (as a percent) 50.00%    
European Property Management and Development | Designer Outlet properties | Minimum      
Investment in Unconsolidated Entities      
Ownership interests acquired (as a percent) 45.00%    
European Property Management and Development | Designer Outlet properties | Maximum      
Investment in Unconsolidated Entities      
Ownership interests acquired (as a percent) 94.00%    
Europe | Klepierre      
Investment in Unconsolidated Entities      
Shares owned | shares 63,924,148    
Ownership interest (as a percent) 21.10%    
Quoted market price per share (in dollars per share) | $ / shares $ 40.36    
Income from unconsolidated entities $ 22,900 7,100  
Total revenues 410,300 342,600  
Total operating income 135,800 105,000  
Consolidated net income $ 202,300 $ 69,500  
Europe | Value Retail PLC      
Investment in Unconsolidated Entities      
Number of luxury outlets owned and operated | property 9    
Number of outlets in which the entity has a minority direct ownership | property 3    
Europe | Value Retail PLC | Deferred costs and other assets      
Investment in Unconsolidated Entities      
Vale of equity instruments $ 140,800   $ 140,800