Annual report pursuant to Section 13 and 15(d)

Investment In Storage Facilities (Schedule Of Acquired Facilities And Purchase Price Of The Facilities) (Details)

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Investment In Storage Facilities (Schedule Of Acquired Facilities And Purchase Price Of The Facilities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 29 7
Purchase Price $ 155,100 $ 34,720
Cash Paid 150,444 34,717
Loan Assumed 2,511  
Net Other Liabilities (Assets) Assumed 2,145 3
Acquisition costs 3,278 786
Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 32,252 5,369
Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 119,320 28,786
In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 3,528 565
Date Of Acquisition, 6/30/2011 | New Jersey [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 1  
Date of Acquisition 6/30/2011  
Purchase Price 4,154  
Cash Paid 4,131  
Net Other Liabilities (Assets) Assumed 23  
Acquisition costs 23  
Date Of Acquisition, 6/30/2011 | New Jersey [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 626  
Date Of Acquisition, 6/30/2011 | New Jersey [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 3,419  
Date Of Acquisition, 6/30/2011 | New Jersey [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 109  
Date Of Acquisition, 7/14/2011 | New Jersey [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 2  
Date of Acquisition 7/14/2011  
Purchase Price 14,571  
Cash Paid 14,439  
Net Other Liabilities (Assets) Assumed 132  
Acquisition costs 467  
Date Of Acquisition, 7/14/2011 | New Jersey [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 1,681  
Date Of Acquisition, 7/14/2011 | New Jersey [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 12,540  
Date Of Acquisition, 7/14/2011 | New Jersey [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 350  
Date Of Acquisition, 7/28/2011 | Missouri [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 1  
Date of Acquisition 7/28/2011  
Purchase Price 2,400  
Cash Paid 2,350  
Net Other Liabilities (Assets) Assumed 50  
Acquisition costs 95  
Date Of Acquisition, 7/28/2011 | Missouri [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 197  
Date Of Acquisition, 7/28/2011 | Missouri [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 2,132  
Date Of Acquisition, 7/28/2011 | Missouri [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 71  
Date Of Acquisition, 8/1711 | Georgia [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 1  
Date of Acquisition 8/1711  
Purchase Price 9,500  
Cash Paid 9,399  
Net Other Liabilities (Assets) Assumed 101  
Acquisition costs 226  
Date Of Acquisition, 8/1711 | Georgia [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 1,043  
Date Of Acquisition, 8/1711 | Georgia [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 8,252  
Date Of Acquisition, 8/1711 | Georgia [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 205  
Date Of Acquisition, 9/22/2011 | Texas [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 22  
Date of Acquisition 9/22/2011  
Purchase Price 110,950  
Cash Paid 106,703  
Loan Assumed 2,511  
Net Other Liabilities (Assets) Assumed 1,736  
Acquisition costs 2,051  
Date Of Acquisition, 9/22/2011 | Texas [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 25,660  
Date Of Acquisition, 9/22/2011 | Texas [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 82,804  
Date Of Acquisition, 9/22/2011 | Texas [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 2,486  
Date Of Acquisition, 9/29/2011 | Virginia [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 1  
Date of Acquisition 9/29/2011  
Purchase Price 8,925  
Cash Paid 8,851  
Net Other Liabilities (Assets) Assumed 74  
Acquisition costs 252  
Date Of Acquisition, 9/29/2011 | Virginia [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 2,848  
Date Of Acquisition, 9/29/2011 | Virginia [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 5,892  
Date Of Acquisition, 9/29/2011 | Virginia [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 185  
Date Of Acquisition, 11/15/2011 | Florida [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties 1  
Date of Acquisition 11/15/2011  
Purchase Price 4,600  
Cash Paid 4,571  
Net Other Liabilities (Assets) Assumed 29  
Acquisition costs 164  
Date Of Acquisition, 11/15/2011 | Florida [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 197  
Date Of Acquisition, 11/15/2011 | Florida [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 4,281  
Date Of Acquisition, 11/15/2011 | Florida [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired 122  
Date Of Acquisition, 12/28/2010 | N.Carolina [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties   1
Date of Acquisition   12/28/2010
Purchase Price   5,040
Cash Paid   5,020
Net Other Liabilities (Assets) Assumed   20
Acquisition costs   157
Date Of Acquisition, 12/28/2010 | N.Carolina [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   846
Date Of Acquisition, 12/28/2010 | N.Carolina [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   4,095
Date Of Acquisition, 12/28/2010 | N.Carolina [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   99
Date Of Acquisition, 12/29/2010 | N.Carolina [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Number of Properties   6
Date of Acquisition   12/29/2010
Purchase Price   29,680
Cash Paid   29,697
Net Other Liabilities (Assets) Assumed   (17)
Acquisition costs   629
Date Of Acquisition, 12/29/2010 | N.Carolina [Member] | Land [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   4,523
Date Of Acquisition, 12/29/2010 | N.Carolina [Member] | Building Equipment And Improvements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   24,691
Date Of Acquisition, 12/29/2010 | N.Carolina [Member] | In-Place Customer Leases [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Fair Value of Assets Acquired   $ 466