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Shareholders' Equity (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
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Jun. 30, 2012
|
Jun. 30, 2013
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Jun. 30, 2012
|
Jun. 30, 2013
Common Stock [Member]
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Mar. 31, 2013
Common Stock [Member]
|
Dec. 31, 2012
Common Stock [Member]
|
Sep. 30, 2012
Common Stock [Member]
|
Jun. 30, 2012
Common Stock [Member]
|
Mar. 31, 2012
Common Stock [Member]
|
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| Shareholders' Equity [Line Items] | ||||||||||
| Dividends per share (in dollars per share) | $ 0.10 | $ 0.07 | $ 0.20 | $ 0.14 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.07 | $ 0.07 |