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Property, Plant, and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Land and land improvements $ 10,538us-gaap_LandAndLandImprovements $ 11,939us-gaap_LandAndLandImprovements
Building and improvements 59,377us-gaap_BuildingsAndImprovementsGross 61,734us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 219,408us-gaap_MachineryAndEquipmentGross 203,052us-gaap_MachineryAndEquipmentGross
Construction in progress 7,859us-gaap_ConstructionInProgressGross 8,142us-gaap_ConstructionInProgressGross
Property, plant, and equipment, gross 297,182us-gaap_PropertyPlantAndEquipmentGross 284,867us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation (167,607)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (153,115)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant, and equipment, net $ 129,575us-gaap_PropertyPlantAndEquipmentNet $ 131,752us-gaap_PropertyPlantAndEquipmentNet