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Earnings Per Common Share (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Stock Conversion Rate 85.5894ofg_StockConversionRate    
Weighted average stock anti dilutive effect excluded from calculation of earnings per share 320,772us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 230,392us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 697,976us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount