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Subsequent Events (Details) (USD $)
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1 Months Ended | 12 Months Ended | |||
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Feb. 29, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Mar. 22, 2012
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| Subsequent Events (Textual) [Abstract] | |||||
| Dividends declared per share | $ 0.30 | $ 0.73 | $ 0.45 | $ 0.40 | |
| Cash dividends, date payable | Mar. 22, 2012 | ||||
| X | ||||||||||
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- Definition
Cash dividends, date payable. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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