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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of unrecognized tax benefits      
Balance at the beginning of the period $ 3,456,000us-gaap_UnrecognizedTaxBenefits $ 3,843,000us-gaap_UnrecognizedTaxBenefits $ 4,683,000us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to prior years 7,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 297,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 527,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions based on tax positions related to prior years (1,146,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (494,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (1,163,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Additions for tax positions of the current year 165,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 837,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 933,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements (680,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (435,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (486,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapse of statute of limitations (495,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (592,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (651,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at the end of the period 1,307,000us-gaap_UnrecognizedTaxBenefits 3,456,000us-gaap_UnrecognizedTaxBenefits 3,843,000us-gaap_UnrecognizedTaxBenefits
Portion of uncertain tax benefit, if recognized, would reduce effective tax rate 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Decrease in accrued interest as a result of the reversal of accrued interest associated with the lapse of statutes of limitations 200,000ssd_UnrecognizedTaxBenefitsDecreaseInInterestOnIncomeTaxesAccrued 300,000ssd_UnrecognizedTaxBenefitsDecreaseInInterestOnIncomeTaxesAccrued 400,000ssd_UnrecognizedTaxBenefitsDecreaseInInterestOnIncomeTaxesAccrued
Accrued interest $ 200,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 400,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 700,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued