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Real Estate Real Estate Dispositions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Disposed Properties			12
Disposed Units			3,184
Proceeds From Sale Of Property			$ 336,250
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	71,097	558,482	204,053	682,236
Consolidated Rental Properties [Member]
Disposed Properties			12
Disposed Units			3,184
Proceeds From Sale Of Property			$ 336,250

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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