Annual report pursuant to Section 13 and 15(d)

Investment In Joint Ventures (Narrative) (Details)

v2.4.0.6
Investment In Joint Ventures (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Sovran HHF Storage Holdings LLC [Member]
Dec. 31, 2008
Sovran HHF Storage Holdings LLC [Member]
Dec. 31, 2011
Sovran HHF Storage Holdings II LLC [Member]
Dec. 31, 2011
Iskalo Office Holdings, LLC [Member]
Dec. 31, 2010
Iskalo Office Holdings, LLC [Member]
Dec. 31, 2009
Iskalo Office Holdings, LLC [Member]
Dec. 31, 2011
Sovran HHF And Sovran HHF II [Member]
Dec. 31, 2010
Sovran HHF And Sovran HHF II [Member]
Dec. 31, 2009
Sovran HHF And Sovran HHF II [Member]
Schedule of Equity Method Investments [Line Items]                        
Ownership interest       20.00%   15.00% 49.00%          
Investment at carrying value $ 31,939,000 $ 19,730,000   $ 20,200,000   $ 11,700,000 $ 500,000 $ 600,000        
Payment for property acquisition         171,500,000 166,100,000            
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           20            
Contribution of company to joint venture as share in capital       800,000 18,600,000 12,800,000 196,049          
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 revenues                   7.00%    
Management and call center fee earned                   1,900,000 1,300,000 1,200,000
Acquisition fee received for securing purchases           700,000            
Company's share in income of joint venture (340,000) 240,000 235,000       (82,000) (79,000) 7,000 (400,000) 300,000 200,000
Property acquisition related costs included in other expenses           5,500,000            
Rent paid during the period             688,000 644,000 608,000      
Future minimum lease payments under the lease, year one 700,000                      
Future minimum lease payments under the lease, year two 700,000                      
Future minimum lease payments under the lease, year three 700,000                      
Future minimum lease payments under the lease, year four $ 700,000