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Stockholders' Equity (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Nov. 30, 2005
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 300,000
Dividend paid per share (in dollars per share) | $ 0.14 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.11 |

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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 The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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