Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Narrative (Details)

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Investments in Unconsolidated Real Estate Joint Ventures - Narrative (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 5 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
ft²
Oct. 31, 2019
May 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
ft²
Jun. 30, 2018
USD ($)
Jul. 31, 2017
USD ($)
Extension
Nov. 30, 2016
USD ($)
Extension
May 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
ft²
Jun. 30, 2016
ft²
Jul. 31, 2014
ft²
Nov. 30, 2013
ft²
Oct. 31, 2012
ft²
Schedule of Equity Method Investments [Line Items]                            
Difference in basis         $ 4,100         $ 3,800        
Square Feet | ft²                   878        
Net proceeds on sale of assets                   $ 128,505        
Charlotte [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²         398         399   398    
Ownership %         50.00%         50.00%        
Columbus [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²         355         355 355      
Ownership %         50.00%         50.00%        
Galveston/Houston [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²         353         353       353
Ownership %         50.00%         50.00%        
National Harbor [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²         341         341     341  
Ownership %         50.00%         50.00%        
RioCan Canada [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²         924         764        
Ownership %         50.00%         50.00%        
Ottawa [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²   357                        
Estimated square feet of expansion | ft²   39                        
Cookstown [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²                   308        
Les Factoreries St. Sauveur Property [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²                   116        
Bromont Outlet Mall Property [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Square Feet | ft²       161                    
Net proceeds on sale of assets       $ 6,400                    
Our Share of Proceeds from Sale of Other Real Estate       3,200                    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax       $ 3,600                    
Unconsolidated Properties [Member] | Mortgages [Member] | Charlotte [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Principal           $ 100,000     $ 90,000          
Stated Interest Rate(s)           4.30%                
Basis spread on variable rate                 1.45%          
Proceeds from joint venture debt           $ 9,300                
Unconsolidated Properties [Member] | Mortgages [Member] | Columbus [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Principal               $ 85,000            
Basis spread on variable rate               1.65%            
Number of mortgage extensions | Extension               2            
Term of debt extension     1 year         1 year            
Proceeds from joint venture debt               $ 84,200            
Unconsolidated Properties [Member] | Mortgages [Member] | Galveston/Houston [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Principal   $ 65,000                        
Basis spread on variable rate   1.50%         1.65%              
Number of mortgage extensions | Extension             2              
Term of debt extension             1 year              
Proceeds from joint venture debt             $ 14,500              
Borrowing capacity   $ 70,000         $ 80,000              
Unconsolidated Properties [Member] | National Harbor [Member] | Mortgages [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Principal $ 87,000       $ 95,000                  
Stated Interest Rate(s)         4.60%                  
Basis spread on variable rate 1.65%                          
Proceeds from joint venture debt         $ 7,400