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Noncontrolling Interests (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
Redeemable noncontrolling interests in the Operating Partnership
Starting redeemable noncontrolling interests in the OP			$ 236,475
Mark to market adjustment to redeemable noncontrolling interests in the OP			2,221
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership			(146)	(48)
Net (income)/loss attributable to redeemable non-controlling interests in OP	5,911	221	9,331	(611)
Distributions to redeemable noncontrolling interests in the OP			(4,538)
Allocation of other comprehensive (loss)/income			(38)
Ending redeemable noncontrolling interests in the OP	243,305		243,305
Net income/(loss) attributable to non-controlling interests	$ 43	$ 37	$ 95	$ 88

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- Definition

Allocation to redeemable non-controllable interests.

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Amount of distributions during the period on redeemable noncontrolling interests in the OP.

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- Definition

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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- Definition

The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

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The portion of net income or loss for the period attributable to redeemable noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. This element should be used for redeemable noncontrolling interests that are classified within temporary equity.

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Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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