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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Property, plant and equipment [Abstract]      
Land $ 4,117us-gaap_Land $ 4,312us-gaap_Land  
Buildings and Improvements 103,083us-gaap_BuildingsAndImprovementsGross 108,460us-gaap_BuildingsAndImprovementsGross  
Machinery and equipment 365,623us-gaap_MachineryAndEquipmentGross 398,490us-gaap_MachineryAndEquipmentGross  
Furniture and fixtures 1,821us-gaap_FurnitureAndFixturesGross 1,884us-gaap_FurnitureAndFixturesGross  
Construction in progress 20,085us-gaap_ConstructionInProgressGross 16,808us-gaap_ConstructionInProgressGross  
Total 494,729us-gaap_PropertyPlantAndEquipmentGross 529,954us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (331,162)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (357,988)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net 163,567us-gaap_PropertyPlantAndEquipmentNet 171,966us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense 23,296us-gaap_Depreciation 22,218us-gaap_Depreciation 21,528us-gaap_Depreciation
Total capital expenditures $ 29,898cbm_PaymentsToAcquirePropertyPlantAndEquipmentAndCapitalExpendituresIncurredButNotYetPaid $ 41,600cbm_PaymentsToAcquirePropertyPlantAndEquipmentAndCapitalExpendituresIncurredButNotYetPaid