Annual report pursuant to Section 13 and 15(d)

Investment In Storage Facilities (Summary Of Activity In Storage Facilities) (Details)

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Investment In Storage Facilities (Summary Of Activity In Storage Facilities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investment In Storage Facilities [Abstract]      
Cost: Beginning balance $ 1,419,956 $ 1,364,454  
Acquisition of storage facilities 151,572 34,155  
Improvements and equipment additions 21,764 23,311  
Increase (decrease) in construction in progress 6,371 (1,788)  
Dispositions and impairments (3,560) (176) (1,167)
Cost: Ending balance 1,596,103 1,419,956 1,364,454
Accumulated Depreciation: Beginning balance 271,797 238,971  
Additions during the year 35,008 32,939  
Dispositions and impairments (1,220) (113)  
Accumulated Depreciation: Ending balance $ 305,585 $ 271,797 $ 238,971