Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Narrative) (Details)

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Discontinued Operations (Narrative) (Details) (USD $)
2 Months Ended 9 Months Ended 12 Months Ended
May 31, 2011
Sep. 30, 2010
Dec. 31, 2010
Discontinued Operations [Abstract]      
Sales of non-strategic storage facilities $ 23,700,000    
Number of non-strategic storage facilities sold by company 10   10
Gain on disposal from discontinued operations   $ 6,944,000 $ 6,944,000