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 Millions
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
ft²
Nov. 30, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment $ 201.1 $ 208.0  
Total Joint Venture Debt 249.8 268.2  
Partnership Interest [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment $ 201.1 $ 208.0  
Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%    
Square Feet | ft² 0    
Carrying Value of Investment $ 21.1    
Total Joint Venture Debt $ 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 $ 6.1 $ 9.5  
Total Joint Venture Debt $ 87.0 $ 83.7  
RioCan Canda [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00%  
Square Feet | ft² 870 870  
Carrying Value of Investment $ 117.2 $ 132.5  
Total Joint Venture Debt $ 11.3 $ 15.7  
Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [1] 50.00% 50.00%  
Square Feet | ft² [1] 377 0  
Carrying Value of Investment [1] $ 44.4 $ 46.5  
Total Joint Venture Debt [1] $ 89.5 $ 25.5  
Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 58.00% 58.00%  
Square Feet | ft² 411 381  
Carrying Value of Investment $ 12.3 $ 14.3  
Total Joint Venture Debt $ 62.0 $ 54.0  
Wisconsin Dells [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership %   50.00%  
Square Feet | ft²   265  
Carrying Value of Investment   $ 2.4  
Total Joint Venture Debt   $ 24.3  
Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Square Feet | ft²   0  
Carrying Value of Investment   $ 1.5  
Total Joint Venture Debt   $ 0.0  
Charlotte [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [2] 50.00% 50.00%  
Square Feet | ft² [2] 398 398  
Carrying Value of Investment [2] $ (1.1) $ (2.2)  
Total Joint Venture Debt 90.0 [2] $ 90.0 [2] $ 90.0
Charlotte and Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (2.6)    
Total Joint Venture Debt $ 155.0    
Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% [2] 50.00%  
Square Feet | ft² 353 [2] 353  
Carrying Value of Investment   $ 1.3  
Carrying Value of Investment [2] $ (1.5)    
Total Joint Venture Debt $ 65.0 [2] $ 65.0  
[1] 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 Tanger Ownership column, which states our legal interest in this venture. As of December 31, 2015, 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.
[2] 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.