Subsequent Events (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Subsequent Events [Abstract]
Date Dividends Declared	2011-07
Date Dividends Will Be Paid	2011-08
Common Stock, Dividends Per Share, Declared (dollars per share)	$ 0.144875
Preferred Stock Class D, Dividends Per Share, Declared (dollars per share)	$ 0.1536459
Preferred Stock Class E, Dividends Per Share, Declared (dollars per share)	$ 0.140625

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

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- Definition

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

+ Details

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- Definition

Month and year subsequent event occurrence or of indication that subsequent event occurred.

+ Details

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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

+ Details

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- Definition

The month and year (YYYY-MM) 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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

+ Details

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- Details

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