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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of unrecognized tax benefits    
Balance as of January 1 $ 1,679us-gaap_UnrecognizedTaxBenefits $ 1,767us-gaap_UnrecognizedTaxBenefits
Additions to tax provisions related to the current year 12us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions to tax positions related to prior years 483us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 484us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reduction to tax positions related to prior years 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (17)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Lapses on statutes of limitations (384)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (555)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance as of December 31 $ 1,790us-gaap_UnrecognizedTaxBenefits $ 1,679us-gaap_UnrecognizedTaxBenefits