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Dividends (Details) (USD $)	0 Months Ended							12 Months Ended			0 Months Ended
	Sep. 19, 2012	May 29, 2012	Apr. 04, 2012	Jan. 10, 2012	Sep. 20, 2011	Jun. 27, 2011	Apr. 07, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 10, 2013 Subsequent Event [Member]
Dividends Payable [Line Items]
Dividends Payable, Date to be Paid, Day, Month and Year	Sep. 19, 2012	May 29, 2012	Apr. 04, 2012	Jan. 10, 2012	Sep. 20, 2011	Jun. 27, 2011	Apr. 07, 2011				Jan. 10, 2013
Dividends Payable, Date of Record, Day, Month and Year	Sep. 07, 2012	May 15, 2012	Mar. 23, 2012	Dec. 30, 2011	Sep. 09, 2011	Jun. 17, 2011	Mar. 25, 2011				Dec. 31, 2012
Dividends per common share (in dollars per share)	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.32	$ 0.32	$ 0.33	$ 0.08

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

+ Details

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X

- 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

+ Details

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Details

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