Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details)
Dec. 31, 2016
USD ($)
ft²
May 31, 2016
ft²
Dec. 31, 2015
USD ($)
ft²
Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 355,000   0
Carrying Value of Investment $ 6,700,000   $ 21,100,000
National Harbor [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 341,000   339,000
Carrying Value of Investment $ 4,100,000   $ 6,100,000
RioCan Canada [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 901,000   870,000
Carrying Value of Investment $ 117,300,000   $ 117,200,000
Columbus National Harbor RioCan Canada [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment $ 128,100,000    
Charlotte [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 398,000   398,000
Carrying Value of Investment $ (2,500,000)   $ (1,100,000)
Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 353,000   353,000
Carrying Value of Investment $ (3,800,000)   $ (1,500,000)
Charlotte and Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (6,300,000)   $ (2,600,000)
Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership %     50.00%
Square Feet | ft²   419,000 377,000
Carrying Value of Investment     $ 44,400,000
Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership %     58.00%
Square Feet | ft²     411,000
Carrying Value of Investment     $ 12,300,000
Columbus National Harbor RioCan Canada Savannah and Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment     201,100,000
Joint Venture Interest [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 335,971,000   400,935,000
Joint Venture Interest [Member] | Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 84,200,000   0
Joint Venture Interest [Member] | National Harbor [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 86,100,000   85,800,000
Joint Venture Interest [Member] | RioCan Canada [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 11,100,000   11,300,000
Joint Venture Interest [Member] | Columbus National Harbor RioCan Canada [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 181,400,000    
Joint Venture Interest [Member] | Charlotte [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 89,700,000   89,600,000
Joint Venture Interest [Member] | Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net 64,900,000   64,700,000
Joint Venture Interest [Member] | Charlotte and Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net $ 154,600,000   154,300,000
Joint Venture Interest [Member] | Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net     87,600,000
Joint Venture Interest [Member] | Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net     61,900,000
Joint Venture Interest [Member] | Columbus National Harbor RioCan Canada Savannah and Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt, Net     $ 246,600,000