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Operations and Summary of Significant Accounting Policies - Plant Closure (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2013
Plant Closure                            
Net book value of the long-lived assets, including land, building and equipment $ 207,027,000us-gaap_PropertyPlantAndEquipmentNet       $ 209,533,000us-gaap_PropertyPlantAndEquipmentNet       $ 207,027,000us-gaap_PropertyPlantAndEquipmentNet $ 209,533,000us-gaap_PropertyPlantAndEquipmentNet   $ 209,533,000us-gaap_PropertyPlantAndEquipmentNet    
Sales of assets                 672,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 5,262,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 7,642,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment      
Gain (loss) on sale of assets (11,000)us-gaap_GainLossOnDispositionOfAssets 17,000us-gaap_GainLossOnDispositionOfAssets 34,000us-gaap_GainLossOnDispositionOfAssets 285,000us-gaap_GainLossOnDispositionOfAssets (1,404,000)us-gaap_GainLossOnDispositionOfAssets (631,000)us-gaap_GainLossOnDispositionOfAssets (11,000)us-gaap_GainLossOnDispositionOfAssets 8,000us-gaap_GainLossOnDispositionOfAssets 325,000us-gaap_GainLossOnDispositionOfAssets (2,038,000)us-gaap_GainLossOnDispositionOfAssets (166,000)us-gaap_GainLossOnDispositionOfAssets      
Facility closing                            
Plant Closure                            
Ireland long lived assets held for sale                     2,800,000us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Net book value of the long-lived assets, including land, building and equipment           1,700,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
        2,700,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  1,700,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
1,700,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Impairment loss on assets held and in use               1,000,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
           
Sales of assets                         1,000,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
 
Gain (loss) on sale of assets                       2,800,000us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
(700,000)us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
 
Net book value of remaining equipment to be sold, transferred or scrapped           100,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
            100,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
100,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Severance costs                   0us-gaap_SeveranceCosts1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
3,000,000us-gaap_SeveranceCosts1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Severance costs paid                     2,400,000ssd_PaymentsOfSeveranceCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
    300,000ssd_PaymentsOfSeveranceCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Severance costs accrued                     600,000us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Severance costs reversed                           200,000ssd_SeveranceCostsReversed
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Severance costs paid in 2014 (less than)                   $ 100,000ssd_SeveranceCostsToBePaidInNextFiscalYearFollowingLatestFiscalYear
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember