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
Jun. 30, 2016
USD ($)
ft²
May 31, 2016
ft²
Dec. 31, 2015
USD ($)
ft²
Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net $ 347,890   $ 400,935
Columbus National Harbor RioCan Canada and Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (in millions) 210,500   201,100
Columbus National Harbor RioCan Canada and Savannah [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1] $ 193,500   $ 246,600
Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 355   0
Carrying Value of Investment (in millions) $ 36,400   $ 21,100
Columbus [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1] $ 0   $ 0
National Harbor [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 339   339
Carrying Value of Investment (in millions) $ 4,900   $ 6,100
National Harbor [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1] $ 86,000   $ 85,800
RioCan Canda [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 902   870
Carrying Value of Investment (in millions) $ 126,800   $ 117,200
RioCan Canda [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1] $ 11,800   $ 11,300
Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [2] 50.00%   50.00%
Square Feet | ft² 419 [2] 419 377 [2]
Carrying Value of Investment (in millions) [2] $ 42,400   $ 44,400
Savannah [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1],[2] 95,700   $ 87,600
Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership %     58.00%
Square Feet | ft²     411
Carrying Value of Investment (in millions)     $ 12,300
Westgate [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1]     61,900
Charlotte and Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment Reported In Liabilities (4,500)   (2,600)
Charlotte and Galveston/Houston [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1] $ 154,400   $ 154,300
Charlotte [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [3] 50.00%   50.00%
Square Feet | ft² [3] 398   398
Equity Method Investment Reported In Liabilities [3] $ (1,600)   $ (1,100)
Charlotte [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1],[3] $ 89,600   $ 89,600
Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [3] 50.00%   50.00%
Square Feet | ft² [3] 353   353
Equity Method Investment Reported In Liabilities [3] $ (2,900)   $ (1,500)
Galveston/Houston [Member] | Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Total joint venture debt, net [1],[3] $ 64,800   $ 64,700
[1] Net of debt origination costs and including premiums of $2.3 million and $3.3 million as of June 30, 2016 and December 31, 2015, respectively.
[2] Based on capital contribution and distribution provisions in the joint venture agreement, we expect our economic interest in the venture's cash flow to be greater than indicated in the Ownership column, which states our legal interest in this venture. As of June 30, 2016, based upon the liquidation proceeds we would receive from a hypothetical liquidation of our investment based on depreciated book value, our estimated economic interest in the venture was approximately 98%. Our economic interest may fluctuate based on a number of factors, including mortgage financing, partnership capital contributions and distributions, and proceeds from gains or losses of asset sales.
[3] The negative carrying value is due to the distributions of proceeds from mortgage loans and quarterly distributions of excess cash flow exceeding the original contributions from the partners.