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Income Taxes (Details) - The unrecognized tax benefits activity (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
The unrecognized tax benefits activity [Abstract]    
Unrecognized tax benefits balance at January 1 $ 351us-gaap_UnrecognizedTaxBenefits $ 678us-gaap_UnrecognizedTaxBenefits
Lapse of statute of limitations (42)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (98)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Gross decreases for tax positions of prior years    (229)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Unrecognized tax benefits balance at December 31 $ 309us-gaap_UnrecognizedTaxBenefits $ 351us-gaap_UnrecognizedTaxBenefits