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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Stockholders Equity [Abstract]        
Cash dividends per common share $ 0.100 $ 0.085 $ 0.285 $ 0.255