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Dividend Reinvestment Plan (Details Textual)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividend Reinvestment Plan (Textual) [Abstract]
Number of Business days	10 days
Issuance of common stock dividend reinvestment plan, shares	0	6,748	17,180

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- Definition

Number of consecutive trading days for purchase of common share.

+ References

No definition available.

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- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: 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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