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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
investment
Dec. 31, 2013
Investments (Textual) [Abstract]    
Investment impairment charges $ 34us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet $ 39us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Number of securities in a gross unrealized loss position 35us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1  
Number of securities in a gross unrealized loss position for more than twelve months 5us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear