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
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2015
USD ($)
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2015
USD ($)
ft²
Extension
Mar. 31, 2015
ft²
Dec. 31, 2014
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]          
Differences in basis   $ 4,000,000 $ 4,000,000   $ 4,400,000
Total Joint Venture Debt (in millions)   230,200,000 $ 230,200,000   $ 268,200,000
Columbus [Member]          
Schedule of Equity Method Investments [Line Items]          
Payments to acquire land   $ 8,900,000      
Square Feet | ft²   0 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     $ 45,800,000    
Square Feet | ft²   377 377   0 [1]
Partner's Portion of Contributed Capital to the Joint Venture     $ 8,300,000    
Preferred return percentage prior to grand opening date     8.00%    
Preferred return percentage after grand opening date     10.00%    
Joint Venture Debt, Maximum Borrowings   $ 97,700,000.0 $ 97,700,000.0    
Joint Venture Debt, Maximum Borrowings That May Be Used For Expansions   4,700,000 $ 4,700,000    
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]   $ 70,100,000 $ 70,100,000   $ 25,500,000
Westgate [Member]          
Schedule of Equity Method Investments [Line Items]          
Square Feet | ft²   411 411 411 381
Joint Venture Debt, Maximum Borrowings   $ 62,000,000.0 $ 62,000,000.0    
Term of mortgage extension     2 years    
Total Joint Venture Debt (in millions)   $ 62,000,000 $ 62,000,000   $ 54,000,000
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)         $ 24,300,000
Net sales price from sale of joint venture $ 15,600,000        
Sales Price 27,700,000        
Company's share of joint venture debt $ 12,100,000        
Gain on sale of assets and interests in unconsolidated entities     $ 13,700,000    
[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 gains or losses of asset sales.