Shareholders' Equity (Details) (USD $)	3 Months Ended
Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Shareholders' Equity
Common stock dividends declared (in dollars per share)	$ 0.12	$ 0.10	$ 0.10	$ 0.10
Current quarter dividend paid in next quarter (in dollars per share)	$ 0.12
Prior quarter dividend paid (in dollars per share)			$ 0.10
Current quarter dividend paid (in dollars per share)		$ 0.10	$ 0.10

The per share amount of a dividend paid during the period which was declared during the current period.

No definition available.

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- Definition

The per share amount of a dividend paid in the next quarter which was declared during the current period.

+ References

No definition available.

+ Details

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- Definition

The per share amount of a dividend paid during the period which was declared in a prior period.

+ References

No definition available.

+ 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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- Details

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