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 $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2010
Disposal Group [Member]
Dec. 31, 2009
Disposal Group [Member]
Impairment charges       $ 111,000 $ 846,000 $ 5,200,000 $ 100,000 $ 5,200,000
Proceeds from Sale of Real Estate   700,000     1,400,000      
Gain (Loss) on Sale of Properties $ 0 $ 0 $ 161,000     $ 3,293,000