The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

Impairment of Real Estate (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended						12 Months Ended
	Sep. 30, 2011 properties TypesOfFinancing shareholders tenants ClassesOfFinancing states	Sep. 30, 2011 Segment, Discontinued Operations [Member]	Sep. 30, 2010 Segment, Continuing Operations [Member]	Sep. 30, 2011 Noncontrolling Interests Properties [Member]	Sep. 30, 2011 Discontinued Operation or Asset Disposal [Member]	Sep. 30, 2010 Discontinued Operation or Asset Disposal [Member]	Dec. 31, 2010 Secured Bond Investment [Member]
Impairment of Real Estate
Impairment charges on real estate		$ 80,407	$ 2,955	$ 29,022	$ 34,422	$ 48,188
Non-recourse mortgage debt, net of escrows, less fair value of property after impairment	6,362
Impairment of real estate noncontrolling partner's share	12,495
Properties having outstanding non-recourse mortgage debt	2
Non-recourse mortgage debt net of lender escrows	21,017
Fair value of properties after impairment charges	14,655
Other than Temporary Impairment Losses, Investments							$ 168