Quarterly report pursuant to Section 13 or 15(d)

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

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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)
ft² in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2015
USD ($)
May. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
ft²
Sep. 30, 2015
USD ($)
ft²
Extension
Dec. 31, 2014
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]            
Differences in basis         $ 3.9 $ 4.4
Total Joint Venture Debt (in millions)         242.7 $ 268.2
Columbus [Member]            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire land     $ 8.9      
Company Portion of Contributed Capital to the Joint Venture         9.8  
Partner's Portion of Contributed Capital to the Joint Venture         $ 9.8  
Square Feet | ft²         0  
Total Joint Venture Debt (in millions)         $ 0.0  
Savannah [Member]            
Schedule of Equity Method Investments [Line Items]            
Company Portion of Contributed Capital to the Joint Venture         45.8  
Partner's Portion of Contributed Capital to the Joint Venture         $ 8.3  
Square Feet | ft²         377 0 [1]
Preferred return percentage prior to grand opening date         8.00%  
Preferred return percentage after grand opening date         10.00%  
Economic interest percentage in joint venture         98.00%  
Joint Venture Debt, Maximum Borrowings   $ 97.7     $ 100.9  
Basis spread on variable rate   1.65%        
Number of mortgage extensions | Extension         2  
Term of mortgage extension         1 year  
Total Joint Venture Debt (in millions) [1]         $ 85.1 $ 25.5
Joint Venture Debt, additional borrowings         $ 15.8  
Estimated Square Feet of Expansion | ft²         42  
Westgate [Member]            
Schedule of Equity Method Investments [Line Items]            
Square Feet | ft²       414 414 381
Term of mortgage extension         2 years  
Total Joint Venture Debt (in millions)         $ 62.0 $ 54.0
Estimated Square Feet of Expansion | ft²       28    
Estimated total square feet of expansion | ft²       78    
Wisconsin Dells [Member]            
Schedule of Equity Method Investments [Line Items]            
Square Feet | ft²           265
Total Joint Venture Debt (in millions)           $ 24.3
Net sales price from sale of joint venture $ 15.6          
Sales Price 27.7          
Company's share of joint venture debt $ 12.1          
Gain on sale of assets and interests in unconsolidated entities       $ 13.7    
[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 the ownership percentage indicated above, which in this case, states our legal interest in this venture. Our economic interest may fluctuate based on a number of factors, including mortgage financing, partnership capital contributions and distributions, and proceeds from asset sales.