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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 458,432us-gaap_PropertyPlantAndEquipmentGross $ 466,362us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (310,709)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (315,010)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property 147,723us-gaap_PropertyPlantAndEquipmentNet 151,352us-gaap_PropertyPlantAndEquipmentNet
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,426us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
3,573us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 111,439us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
110,144us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 328,471us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
335,318us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 15,096us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 17,327us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember