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Subsequent Event-Dividend Declaration (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Subsequent Event-Dividend Declaration (Textual) [Abstract]
Cash Dividends declared per common share	$ 0.21	$ 0.21	$ 0.18	$ 0.63	$ 0.54

X

- Definition

Subsequent Event Dividend Declaration.

+ Details

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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

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