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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Unaudited) (USD $) | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
Consolidated Statements of Changes In Shareholders' Equity [Abstract] |  |
Common stock, par value | $ 0.001 | $ 0.001
Options exercised, shares | 190,897 | 136,290
Conversion of common stock units, shares | 10,696 | 15,715
Conversion of restricted stock units, shares | 85,641 | 170,876
Cash dividends, per share | $ 0.26 | $ 0.22
Treasury stock, beginning balance, shares | 22,028,030 | 21,813,196
Treasury stock, acquisition of shares | 705,057 | 60,126
Treasury stock, ending balance, shares | 22,733,087 | 21,873,322

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- Definition Aggregate dividends paid 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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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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