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Shareholders' Equity (Details) (USD $)
0 Months Ended3 Months Ended9 Months Ended
Aug. 24, 2011
Jul. 28, 2011
May 25, 2011
Apr. 27, 2011
Mar. 03, 2011
Feb. 03, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Oct. 27, 2011
Dividend Declared [Member]
Subsequent Event [Line Items]           
Quarterly cash dividend payable          $ 0.08
Special cash dividend payable          $ 0.05
Declared quarterly cash dividend $ 0.06 $ 0.05 $ 0.03     
Quarterly cash dividend paid$ 0.06 $ 0.05 $ 0.03 $ 0.06$ 0.01$ 0.14$ 0.03