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Investment in and Advances to Non-Consolidated Entities (Details) (USD $)
1 Months Ended 12 Months Ended
Jun. 30, 2014
sqft
Jun. 30, 2014
Joint Venture [Member]
Oct. 31, 2013
Joint Venture [Member]
Sep. 30, 2013
Joint Venture [Member]
Aug. 31, 2013
Baltimore, Maryland [Member]
Joint Venture [Member]
Jul. 31, 2013
Long Island City, New York [Member]
Joint Venture [Member]
Mar. 31, 2013
Palm Beach Gardens, Florida [Member]
Joint Venture [Member]
Dec. 31, 2012
Palm Beach Gardens, Florida [Member]
Joint Venture [Member]
sqft
Dec. 31, 2012
Humble, Texas [Member]
Joint Venture [Member]
Dec. 31, 2012
Nonrecourse Mortgage [Member]
Humble, Texas [Member]
Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]                    
Ownership percentage of equity method investment     15.00%       25.00% 36.00% 15.00%  
Investment in joint venture     $ 39,456,000   $ 5,000,000 $ 8,918,000   $ 29,750,000    
Lease Term (Years)     20 years   99 years     15 years 17 years  
Advances to affiliate     18,791,000         12,000,000    
Stated interest rate     4.01%             4.70%
Other than temporary impairment on joint venture   650,000   925,000            
Square Feet 1,107,000             120,000    
Distributions payable to real estate partnerships             2,557,000      
Economic interest in joint venture                 100.00%  
Property purchase price                 27,750,000  
Face amount of debt instrument                   $ 15,260,000