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Dividends (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Sep. 19, 2012 | May 29, 2012 | Apr. 04, 2012 | Jan. 10, 2012 | Sep. 20, 2011 | Jun. 27, 2011 | Apr. 07, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 10, 2013 Subsequent Event [Member]
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid, Day, Month and Year | Sep. 19, 2012 | May 29, 2012 | Apr. 04, 2012 | Jan. 10, 2012 | Sep. 20, 2011 | Jun. 27, 2011 | Apr. 07, 2011 |  |  |  | Jan. 10, 2013
Dividends Payable, Date of Record, Day, Month and Year | Sep. 07, 2012 | May 15, 2012 | Mar. 23, 2012 | Dec. 30, 2011 | Sep. 09, 2011 | Jun. 17, 2011 | Mar. 25, 2011 |  |  |  | Dec. 31, 2012
Dividends per common share (in dollars per share) | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.32 | $ 0.32 | $ 0.33 | $ 0.08

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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