Aggregate Square Footage of Buildings to be Sold under Purchase and Sale Agreement

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- Definition

Number of Buildings to be Sold under Purchase and Sale Agreement

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- Definition

Sales Price of Real Estate Properties

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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- Definition

The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

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- Definition

Cash inflow related to amounts received in advance from a potential buyer showing or confirming an intention to complete an acquisition of land, buildings, other structures, or any item classified as real estate.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Subsequent Events (Details) (USD $)	9 Months Ended							0 Months Ended
Subsequent Events (Details) (USD $)	Sep. 30, 2011 Declaration of Dividends [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Common Stock [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Series J Preferred Stock [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Series K Preferred Stock [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Series L Preferred Stock [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Series M Preferred Stock [Member]	Sep. 30, 2011 Declaration of Dividends [Member] Series O Preferred Stock [Member]	Oct. 20, 2011 Portfolio Disposition Agreement [Member] buildings sqft
Subsequent Event [Line Items]
Common stock dividends declared per share		$ 0.17
Preferred stock dividends declared per share			$ 0.414063	$ 0.406250	$ 0.412500	$ 0.434375	$ 0.523438
Record date		Nov. 16, 2011	Nov. 16, 2011	Nov. 16, 2011	Nov. 16, 2011	Dec. 16, 2011	Dec. 16, 2011
Payment date		Nov. 30, 2011	Nov. 30, 2011	Nov. 30, 2011	Nov. 30, 2011	Dec. 31, 2011	Dec. 31, 2011
Declared date	Oct. 26, 2011
Number of buildings to be sold under Purchase Agreement								82
Aggregate square footage of buildings to be sold under Purchase Agreement								10,100,000
Negotiated purchase price under Purchase Agreement								$ 1,080,000,000
Nonrefundable deposit paid by buyer								$ 40,000,000