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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]    
Cash dividends per common share $ 0.12us-gaap_CommonStockDividendsPerShareDeclared $ 0.10us-gaap_CommonStockDividendsPerShareDeclared