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Property, Plant, and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 466,362us-gaap_PropertyPlantAndEquipmentGross $ 480,400us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation (315,010)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (327,645)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net property 151,352us-gaap_PropertyPlantAndEquipmentNet 152,755us-gaap_PropertyPlantAndEquipmentNet 147,465us-gaap_PropertyPlantAndEquipmentNet
Land      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3,573us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
3,835us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Building      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 110,144us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
110,534us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Machinery and Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 335,318us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
349,667us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 17,327us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 16,364us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember