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Discontinued Operations and Gain on Disposition of Rental Properties (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Gain Loss on Disposition of Rental Properties
Gain (Loss) on disposition of rental properties	$ 8,879	$ 10,431
Quebec Square (Specialty Retail Center) [Member]
Gain Loss on Disposition of Rental Properties
Gain (Loss) on disposition of rental properties	8,879
Charleston Marriott (Hotel) [Member]
Gain Loss on Disposition of Rental Properties
Gain (Loss) on disposition of rental properties		$ 10,431

Pretax gain (loss), 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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