v2.4.1.9
Property, Plant, and Equipment (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant, and Equipment      
Gross property, plant and equipment $ 591,328,000us-gaap_PropertyPlantAndEquipmentGross   $ 589,157,000us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation 191,030,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   184,223,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net 400,298,000us-gaap_PropertyPlantAndEquipmentNet   404,934,000us-gaap_PropertyPlantAndEquipmentNet
Capitalized interest 0us-gaap_InterestCostsIncurredCapitalized 35,000us-gaap_InterestCostsIncurredCapitalized  
Depreciation and amortization not included in direct operating expenses 6,600,000uan_DepreciationAndAmortizationNotIncludedInDirectOperatingExpenses 6,600,000uan_DepreciationAndAmortizationNotIncludedInDirectOperatingExpenses  
Depreciation and amortization not included in cost of products sold expense 200,000uan_DepreciationandAmortizationNotIncludedinCostofProductsSoldExpense 100,000uan_DepreciationandAmortizationNotIncludedinCostofProductsSoldExpense  
Land and improvements      
Property, Plant, and Equipment      
Gross property, plant and equipment 5,333,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
  5,263,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Buildings and improvements      
Property, Plant, and Equipment      
Gross property, plant and equipment 2,830,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
  2,266,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Machinery and equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 559,526,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
  559,210,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Automotive equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 497,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TransportationEquipmentMember
  497,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TransportationEquipmentMember
Furniture and fixtures      
Property, Plant, and Equipment      
Gross property, plant and equipment 882,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  882,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Railcars      
Property, Plant, and Equipment      
Gross property, plant and equipment 14,519,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_RailroadTransportationEquipmentMember
  14,524,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_RailroadTransportationEquipmentMember
Construction in progress      
Property, Plant, and Equipment      
Gross property, plant and equipment $ 7,741,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
  $ 6,515,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember