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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Condensed Consolidated Statements of Stockholders' Equity |  |
Cash dividends declared on common stock, per share (in dollars per share) | $ 0.375 | $ 0.375
Common stock issued per share for stock bonus (in dollars per share) | $ 33.71 | $ 30.91

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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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