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Real Estate Real Estate Dispositions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Disposed Properties	3
Disposed Units	1,522
Proceeds From Sale Of Property	$ 206,350
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	132,956	123,754
Consolidated Rental Properties [Member]
Disposed Properties	3
Disposed Units	1,522
Proceeds From Sale Of Property	$ 206,350

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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