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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of unrecognized tax benefits, excluding penalties and interest      
Balance at the beginning of the period $ 9,013us-gaap_UnrecognizedTaxBenefits $ 8,322us-gaap_UnrecognizedTaxBenefits $ 7,467us-gaap_UnrecognizedTaxBenefits
Increases during the year:      
Gross increases - tax positions in prior period 433us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 644us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 275us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross increases - current-period tax positions 656us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 1,355us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,215us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decreases during the year:      
Gross decreases - tax positions in prior period (192)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (71)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (429)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Decreases due to settlements with taxing authorities (877)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (154)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Decreases due to lapse of statute of limitations (928)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1,083)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1,206)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at the end of the period $ 8,105us-gaap_UnrecognizedTaxBenefits $ 9,013us-gaap_UnrecognizedTaxBenefits $ 8,322us-gaap_UnrecognizedTaxBenefits
Number of open tax years settled 6 years 4 years 3 years