Quarterly report pursuant to Section 13 or 15(d)

Investment In Joint Ventures (Narrative) (Details)

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Investment In Joint Ventures (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2008
Dec. 31, 2008
Sovran HHF Storage Holdings LLC [Member]
Sep. 30, 2011
Sovran HHF Storage Holdings LLC [Member]
Sep. 30, 2011
Sovran HHF Storage Holdings II LLC [Member]
Sep. 30, 2011
Iskalo Office Holdings, LLC [Member]
Sep. 30, 2010
Iskalo Office Holdings, LLC [Member]
Sep. 30, 2011
Iskalo Office Holdings, LLC [Member]
Sep. 30, 2010
Iskalo Office Holdings, LLC [Member]
Dec. 31, 2010
Iskalo Office Holdings, LLC [Member]
Sep. 30, 2011
Sovran HHF And Sovran HHF II [Member]
Sep. 30, 2010
Sovran HHF And Sovran HHF II [Member]
Sep. 30, 2011
Sovran HHF And Sovran HHF II [Member]
Sep. 30, 2010
Sovran HHF And Sovran HHF II [Member]
Schedule of Equity Method Investments                                    
Ownership interest               20.00% 15.00% 49.00%   49.00%            
Investment at carrying value $ 30,911,000   $ 30,911,000   $ 19,730,000     $ 19,800,000 $ 11,100,000 $ (500,000)   $ (500,000)   $ (600,000)        
Payment for property acquisition           171,500,000     160,400,000                  
Acquisition costs 2,913,000 23,000 3,048,000 136,000         4,900,000               700,000  
Additional properties acquired     0                              
Number of properties owned and managed under twenty-percent stake joint venture           25                        
Number of properties owned and managed under fifteen-percent stake joint venture 19   19                              
Contribution of company to joint venture as share in capital             18,600,000   11,800,000     196,049            
Excess of investment over net asset due to capitalization of acquisition related costs               1,700,000                    
Management and call center fee as a percentage of revenue                                 7.00%  
Management and call center fee earned                             600,000 300,000 1,200,000 900,000
Acquisition fee received for securing purchases                 700,000                  
Company's share in income of joint venture (512,000) 16,000 (408,000) 154,000           (4,000) (48,000) (59,000) (22,000)   (637,000) 53,000 (497,000) 146,000
Property acquisition related costs included in other expenses                 $ 4,900,000