Quarterly report pursuant to Section 13 or 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
Mar. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
ft²
Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 336,066 $ 335,971
Columbus National Harbor RioCan Canada [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment 127,900 128,100
Columbus National Harbor RioCan Canada [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 181,400 $ 181,400
Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 355 355
Carrying Value of Investment $ 6,600 $ 6,700
Columbus [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 84,200 $ 84,200
National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 341 341
Carrying Value of Investment $ 3,200 $ 4,100
National Harbor [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 86,200 $ 86,100
RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 926 901
Carrying Value of Investment $ 118,100 $ 117,300
RioCan Canda [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 11,000 11,100
Charlotte and Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment Reported In Liabilities (7,100) (6,300)
Charlotte and Galveston/Houston [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 154,700 $ 154,600
Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 398 398
Equity Method Investment Reported In Liabilities $ (2,600) $ (2,500)
Charlotte [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 89,800 $ 89,700
Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 353 353
Equity Method Investment Reported In Liabilities $ (4,500) $ (3,800)
Galveston/Houston [Member] | Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net $ 64,900 $ 64,900