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Real Estate Assets (Details) (USD $)	3 Months Ended
Real Estate Assets (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011
Dispositions [Abstract]
Gains on disposition of discontinued operations	$ 5,134,000	$ 0
Kansas City, MO Rental Residential Disposition [Member]
Dispositions [Abstract]
Number of rental residential units sold (in units)	96
Gross proceeds from the sale of real estate	11,000,000
Gains on disposition of discontinued operations	$ 5,100,000

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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