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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common stock cash distributions (in dollars per share)	$ 0.465	$ 0.455	$ 0.435	$ 0.435	$ 0.42	$ 0.42	$ 0.42	$ 0.42	$ 1.79	$ 1.68	$ 1.58
Series E Preferred Stock
Conversion of preferred stock, partial and full redemption (as a percent)											8.50%
Series F Preferred Stock
Conversion of preferred stock, partial and full redemption (as a percent)										8.00%	8.00%

X

- Definition

Aggregate dividends paid 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

+ Details

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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