Annual report pursuant to Section 13 and 15(d)

Discontinued Operations (Narrative) (Details)

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Discontinued Operations (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Discontinued Operations [Abstract]      
Sales of non-strategic storage facilities   $ 23,700,000 $ 16,300,000
Number of non-strategic storage facilities sold by company   10 5
Income from continuing operations attributable to common shareholders 30,600,000 33,200,000 18,900,000
Income from continuing operations attributable to common shareholders 30,592,000 33,080,000 18,843,000
Income from discontinued operations attributable to common shareholders 0 7,500,000 1,100,000
Gain (loss) on disposal from discontinued operations    $ 6,944,000 $ (1,636,000)