Annual report pursuant to Section 13 and 15(d)

Disposition of Properties and Properties Held for Sale - Land Outparcel Sales (Details)

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Disposition of Properties and Properties Held for Sale - Land Outparcel Sales (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Outparcel Land Sales [Line Items]            
Number of Outparcel Sales       0 3,000 1,000
Net Proceeds from Land Outparcel Sales $ 0   $ 602,000   $ 0 $ 1,577,000
Gain (Loss) on Sale of Properties $ 0 $ 0 $ 161,000     $ 3,293,000