Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details)

v2.4.0.6
Fair Value Measurements (Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of self-storage facilities acquired 29 7
Impairment charge $ 1,047  
Interest Rate Swaps [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (10,748)  
Interest Rate Swaps [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps     
Interest Rate Swaps [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (10,748)  
Interest Rate Swaps [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps