Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Common Stock [Member]
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]
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