Annual report pursuant to Section 13 and 15(d)

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

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Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details)
ft² in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
ft²
Jun. 30, 2016
ft²
Jul. 31, 2014
ft²
Nov. 30, 2013
ft²
Oct. 31, 2012
ft²
Columbus [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership % 50.00% 50.00%        
Square Feet | ft² 355 355 355      
Investments included in investments in unconsolidated joint ventures $ 1,100 $ 6,700        
National Harbor [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership % 50.00% 50.00%        
Square Feet | ft² 341 341     341  
Investments included in investments in unconsolidated joint ventures $ 2,500 $ 4,100        
RioCan Canada [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership % 50.00% 50.00%        
Square Feet | ft² 923 901        
Investments included in investments in unconsolidated joint ventures $ 115,800 $ 117,300        
Columbus National Harbor RioCan Canada [Member]            
Schedule of Equity Method Investments [Line Items]            
Investments included in investments in unconsolidated joint ventures $ 119,400 $ 128,100        
Charlotte [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership % 50.00% 50.00%        
Square Feet | ft² 398 398   398    
Investments included in other liabilities $ (4,100) $ (2,500)        
Galveston/Houston [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership % 50.00% 50.00%        
Square Feet | ft² 353 353       353
Investments included in other liabilities $ (13,000) $ (3,800)        
Charlotte and Galveston/Houston [Member]            
Schedule of Equity Method Investments [Line Items]            
Investments included in other liabilities (17,100) (6,300)        
Unconsolidated Properties [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 351,259 335,971        
Unconsolidated Properties [Member] | Columbus [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 84,400 84,200        
Unconsolidated Properties [Member] | National Harbor [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 86,400 86,100        
Unconsolidated Properties [Member] | RioCan Canada [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 11,100 11,100        
Unconsolidated Properties [Member] | Charlotte [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 89,800 89,700        
Unconsolidated Properties [Member] | Galveston/Houston [Member]            
Schedule of Equity Method Investments [Line Items]            
Total Joint Venture Debt, Net 79,400 64,900        
Mortgages [Member] | Unconsolidated Properties [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt origination costs and premiums $ 1,400 $ 1,600