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Income Taxes - Unrecognized Tax Benefits Activity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Unrecognized Tax Benefits Roll Forward    
Beginning Balance $ 14,382us-gaap_UnrecognizedTaxBenefits $ 13,238us-gaap_UnrecognizedTaxBenefits
Additions For Tax Positions Related To Prior Year 76us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 317us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions For Tax Positions Related To Prior Year 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (48)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Additions For Tax Positions Related To Current Year 963us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 990us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions from a lapse of applicable statute of limitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (115)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Ending Balance $ 15,421us-gaap_UnrecognizedTaxBenefits $ 14,382us-gaap_UnrecognizedTaxBenefits