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Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012
Common distributions declared per share	$ 0.440
Preferred Stock [Member]
Redemption of 3,264,362 shares of 6.75% Series G Cumulative Redeemable Shares, Shares	3,264,362
6.75% Series G Cumulative Redeemable Preferred Stock
Preferred stock distributions declared	$ 0.567188
Series E Preferred Stock [Member]
Preferred stock distributions declared	$ 0.6644

X

- 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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Period Type:	duration

X

- Definition

Per share amount of cumulative preferred dividends in arrears.

+ References

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



-Publisher FASB



-Name Statement of Financial Accounting Standard (FAS)



-Number 129



-Paragraph 7



-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 505



-SubTopic 10



-Section 50



-Paragraph 5



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

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X

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

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



-Publisher FASB



-Name Statement of Financial Accounting Standard (FAS)



-Number 129



-Paragraph 4, 5



-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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