Stockholders' Equity of the REIT and Partners' Capital of the Operating Partnership (Details) (USD $) In Thousands, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Schedule of preferred stock
Total preferred stock	$ 582,200	$ 350,000
Series L Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	49,100	0
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	2,000	2,000
Preferred shares, shares outstanding	2,000	2,000
Series M Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	57,500	0
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	2,300	2,300
Preferred shares, shares outstanding	2,300	2,300
Series O Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	75,300	0
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	3,000	3,000
Preferred shares, shares outstanding	3,000	3,000
Series P Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	50,300	0
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	2,000	2,000
Preferred shares, shares outstanding	2,000	2,000
Series Q Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	100,000	100,000
Preferred shares, liquidation preference per share	$ 50	$ 50
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	2,000	2,000
Preferred shares, shares outstanding	2,000	2,000
Series R Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	125,000	125,000
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	5,000	5,000
Preferred shares, shares outstanding	5,000	5,000
Series S Preferred Stock [Member]
Schedule of preferred stock
Total preferred stock	$ 125,000	$ 125,000
Preferred shares, liquidation preference per share	$ 25	$ 25
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares issued	5,000	5,000
Preferred shares, shares outstanding	5,000	5,000

Preferred stock issue and outstanding.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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-Publisher FASB

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4, 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 02

-Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

+ References

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Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders.

+ References

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