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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
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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 | $ 207,027,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | $ 209,533,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | $ 207,027,000 us-gaap_PropertyPlantAndEquipmentNet | $ 209,533,000 us-gaap_PropertyPlantAndEquipmentNet |  | $ 209,533,000 us-gaap_PropertyPlantAndEquipmentNet |  |
Sales of assets |  |  |  |  |  |  |  |  | 672,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 5,262,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 7,642,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |
Gain (loss) on sale of assets | (11,000)us-gaap_GainLossOnDispositionOfAssets | 17,000 us-gaap_GainLossOnDispositionOfAssets | 34,000 us-gaap_GainLossOnDispositionOfAssets | 285,000 us-gaap_GainLossOnDispositionOfAssets | (1,404,000)us-gaap_GainLossOnDispositionOfAssets | (631,000)us-gaap_GainLossOnDispositionOfAssets | (11,000)us-gaap_GainLossOnDispositionOfAssets | 8,000 us-gaap_GainLossOnDispositionOfAssets | 325,000 us-gaap_GainLossOnDispositionOfAssets | (2,038,000)us-gaap_GainLossOnDispositionOfAssets | (166,000)us-gaap_GainLossOnDispositionOfAssets |  |  |
Facility closing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant Closure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ireland long lived assets held for sale |  |  |  |  |  |  |  |  |  |  | 2,800,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |
Net book value of the long-lived assets, including land, building and equipment |  |  |  |  |  | 1,700,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  |  | 2,700,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  | 1,700,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,700,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Impairment loss on assets held and in use |  |  |  |  |  |  |  | 1,000,000 us-gaap_ImpairmentOfRealEstate / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  |  |  |
Sales of assets |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 us-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 |  |  |  |  |  | 100,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  |  |  |  | 100,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 100,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Severance costs |  |  |  |  |  |  |  |  |  | 0 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 3,000,000 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |
Severance costs paid |  |  |  |  |  |  |  |  |  |  | 2,400,000 ssd_PaymentsOfSeveranceCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  | 300,000 ssd_PaymentsOfSeveranceCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Severance costs accrued |  |  |  |  |  |  |  |  |  |  | 600,000 us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |
Severance costs reversed |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 ssd_SeveranceCostsReversed / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Severance costs paid in 2014 (less than) |  |  |  |  |  |  |  |  |  | $ 100,000 ssd_SeveranceCostsToBePaidInNextFiscalYearFollowingLatestFiscalYear / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  |

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