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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Stockholders' Equity
Cash dividends declared on common stock, per share (in dollars per share)		$ 0.125
Common stock issued per share for stock bonus (in dollars per share)	$ 33.83	$ 33.71

X

- Definition

The amount of each share issued during the period as a result of share-based compensation plans other than an employee stock ownership plan (ESOP).

+ References

No definition available.

+ 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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- Details

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