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Property, Plant and Equipment, net (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment      
Property, plant and equipment, gross $ 438,490,000us-gaap_PropertyPlantAndEquipmentGross $ 438,782,000us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation and amortization (245,383,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (235,535,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, plant and equipment excluding capital projects in progress, net 193,107,000ssd_PropertyPlantAndEquipmentExcludingCapitalProjectsInProgress 203,247,000ssd_PropertyPlantAndEquipmentExcludingCapitalProjectsInProgress  
Capital projects in progress 13,920,000us-gaap_ConstructionInProgressGross 6,286,000us-gaap_ConstructionInProgressGross  
Property, plant and equipment, net 207,027,000us-gaap_PropertyPlantAndEquipmentNet 209,533,000us-gaap_PropertyPlantAndEquipmentNet  
Original cost of fully depreciated assets still in use 161,100,000ssd_FullyDepreciatedPropertyPlantAndEquipmentOriginalCost 147,900,000ssd_FullyDepreciatedPropertyPlantAndEquipmentOriginalCost  
Depreciation expense 20,400,000us-gaap_Depreciation 20,100,000us-gaap_Depreciation 19,000,000us-gaap_Depreciation
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 29,390,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
29,347,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 175,058,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
178,391,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
 
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,602,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
5,213,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Machinery and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 228,440,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
225,831,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Machinery and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 1,800,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
1,600,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
 
Capital projects in progress $ 8,300,000us-gaap_ConstructionInProgressGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
$ 100,000us-gaap_ConstructionInProgressGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember