Annual report pursuant to Section 13 and 15(d)

Development of Rental Properties - Impairment Charge (Details)

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Development of Rental Properties - Impairment Charge (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2011
Feb. 28, 2010
Sep. 30, 2010
Jun. 30, 2010
Sep. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Impairment charges   $ 735,000     $ 111,000 $ 0 $ 0.0   $ 5,200,000
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  
Disposal Group [Member]
                 
Impairment charges     $ 111,000