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Shareholders' Equity (Details) (USD $)
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3 Months Ended | ||||
|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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| Shareholders' Equity [Line Items] | |||||
| Dividends per share (in dollars per share) | $ 0.10 | $ 0.07 | |||
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Common Stock [Member]
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| Shareholders' Equity [Line Items] | |||||
| Dividends per share (in dollars per share) | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.07 | $ 0.07 |