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Stockholders' Equity - Stockholders' Equity Preferred Stock (Details) (Preferred Stock [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Dividend One [Member]
Class of Stock [Line Items]
Declaration Date	Mar. 15, 2013
Record Date	Mar. 28, 2013
Payment Date	Apr. 15, 2013
Dividend Amount (in dollars per share)	$ 0.5391
Dividend Two [Member]
Class of Stock [Line Items]
Declaration Date	Jun. 12, 2013
Record Date	Jun. 28, 2013
Payment Date	Jul. 15, 2013
Dividend Amount (in dollars per share)	$ 0.5391

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ 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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+ 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



Reference 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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