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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Subsequent Events (Textuals) |  |  |  |  |  |
Cash dividend declared | $ 0.25 |  |  |  |  |
Quarterly cash dividend per share declared |  | $ 0.24 | $ 0.24 | $ 0.96 | $ 0.96 | $ 0.96
Dividend Declared |  |  |  |  |  |
Subsequent Events (Textuals) |  |  |  |  |  |
Quarterly cash dividends declared | $ 4.9 |  |  |  |  |

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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 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 Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Name Accounting Standards Codification -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 165 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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