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 $)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2011
Sep. 30, 2010
Jun. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]            
Number of Outparcel Sales       0 0 3,000
Net Proceeds from Land Outparcel Sales $ 724,000 $ 1,400,000 $ 200,000 $ 0 $ 0 $ 602,000
Gain (Loss) on Sale of Properties $ 0     $ 0 $ 0 $ 161,000