Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)
ft² in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2016
USD ($)
ft²
May 31, 2016
ft²
Dec. 31, 2015
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]      
Differences in basis $ 4.4   $ 3.9
Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Square Feet | ft² 355   0
Company Portion of Contributed Capital to the Joint Venture $ 35.8    
Projected net costs to complete project 94.9    
Partner's Portion of Contributed Capital to the Joint Venture $ 35.8    
Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Economic interest percentage in joint venture 98.00%    
Square Feet | ft² 419 [1] 419 377 [1]
Estimated Square Feet of Expansion | ft²   42  
Joint Venture [Member] | Mortgages [Member]      
Schedule of Equity Method Investments [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 2.3   $ 3.3
[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 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.