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
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Shareholders' Equity [Abstract]        
Cash dividend declared per share of common stock (dollars in per shares) $ 0.07 $ 0.07 $ 0.14 $ 0.14