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Fair Value Information and Derivative Financial Instruments (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Information and Derivative Financial Instruments [Abstract]      
Total derivative ineffectiveness expense $ 0us-gaap_GainLossOnFairValueHedgeIneffectivenessNet $ 0us-gaap_GainLossOnFairValueHedgeIneffectivenessNet $ 0us-gaap_GainLossOnFairValueHedgeIneffectivenessNet
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax $ 3,500,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax $ (100,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax