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Property, Plant, and Equipment Property, Plant, and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Land and improvements $ 51,748us-gaap_LandAndLandImprovements $ 16,021us-gaap_LandAndLandImprovements
Buildings and improvements 403,784us-gaap_BuildingsAndImprovementsGross 340,609us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 1,395,221us-gaap_MachineryAndEquipmentGross 1,464,532us-gaap_MachineryAndEquipmentGross
Construction in progress 182,393us-gaap_ConstructionInProgressGross 221,101us-gaap_ConstructionInProgressGross
Property, plant and equipment, gross 2,033,146us-gaap_PropertyPlantAndEquipmentGross 2,042,263us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (741,928)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (794,602)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment - net $ 1,291,218us-gaap_PropertyPlantAndEquipmentNet $ 1,247,661us-gaap_PropertyPlantAndEquipmentNet