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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Stockholder's Equity |  |  |
Cash dividends declared on common stock, per share | $ 0.50 | $ 0.40 | $ 0.40
Common stock issued, per share | $ 30.91 | $ 26.42 | $ 27.76

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- 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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- 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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