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 Millions
Mar. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt (in millions) [1] $ 253.2 $ 246.6
Partnership Interest [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment (in millions) $ 218.7 $ 201.1
Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 0 0
Carrying Value of Investment (in millions) $ 30.7 $ 21.1
Total Joint Venture Debt (in millions) [1] $ 0.0 $ 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) $ 5.5 $ 6.1
Total Joint Venture Debt (in millions) [1] $ 85.9 $ 85.8
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) $ 126.4 $ 117.2
Total Joint Venture Debt (in millions) [1] $ 11.9 $ 11.3
Savannah [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % [2] 50.00% 50.00%
Square Feet | ft² [2] 377 377
Carrying Value of Investment (in millions) [2] $ 43.8 $ 44.4
Total Joint Venture Debt (in millions) [1],[2] $ 93.5 $ 87.6
Westgate [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 58.00% 58.00%
Square Feet | ft² 411 411
Carrying Value of Investment (in millions) $ 12.3 $ 12.3
Total Joint Venture Debt (in millions) [1] $ 61.9 $ 61.9
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] $ (1.4) $ (1.1)
Total Joint Venture Debt (in millions) [1],[3] $ 89.6 $ 89.6
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] $ (2.1) $ (1.5)
Total Joint Venture Debt (in millions) [1],[3] 64.8 64.7
Charlotte and Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment Reported In Liabilities (3.5) (2.6)
Total Joint Venture Debt (in millions) [1] $ 154.4 $ 154.3
[1] Net of debt origination costs and including premiums of $2.8 million and $3.3 million as of March 31, 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 March 31 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.