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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]        
Cash dividends per common share $ 0.12 $ 0.10 $ 0.36 $ 0.30