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Property and Equipment, Net - Property and Equipment Table (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 468,260us-gaap_PropertyPlantAndEquipmentGross $ 419,440us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation 235,610us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 213,290us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 232,650us-gaap_PropertyPlantAndEquipmentNet 206,150us-gaap_PropertyPlantAndEquipmentNet
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 15,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember		 5,520us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 69,820us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 61,960us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 383,440us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember		 $ 351,960us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember