Noncontrolling Interests (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Noncontrolling Interests in the Operating Partnership
Beginning noncontrolling interests in the Operating Partnership			$ 120,838	$ 129,769
Adjustments of noncontrolling interests in the Operating Partnership to fair value			6,957	(20,612)
Conversion of Common Units to Common Stock			(635)	(2,958)
Net income attributable to noncontrolling interests in the Operating Partnership	623	1,933	1,130	2,453
Distributions to noncontrolling interests in the Operating Partnership			(3,215)	(3,243)
Total noncontrolling interests in the Operating Partnership	125,075	105,409	125,075	105,409
Net Income Available for Common Stockholders and Transfers From Noncontrolling Interests in the Operating Partnership.
Net income available for common stockholders	10,112	36,224	20,248	45,895
Increase in additional paid in capital from conversion of Common Units to Common Stock	449	33	635	2,957
Change in equity from net income available for common stockholders and conversion of Common Units to Common Stock	$ 10,561	$ 36,257	$ 20,883	$ 48,852
Consolidated joint venture, partner's interest (in hundredths)	50.00%		50.00%

Increase in Additional Paid In Capital from value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real investment trust unit (UPREIT unit).

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Noncontrolling Interests In The Operating Partnership

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This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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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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Amount of net Income or Loss for the period allocated to noncontrolling partners in an operating partnership included in the entity's consolidated financial statements.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The cash outflow for the return on capital for noncontrolled interest in the entity.

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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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