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Property, Plant & Equipment (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 134,357,000us-gaap_PropertyPlantAndEquipmentGross   $ 119,933,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (59,345,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (57,938,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment — net 75,012,000us-gaap_PropertyPlantAndEquipmentNet   61,995,000us-gaap_PropertyPlantAndEquipmentNet
Capital expenditures in progress 2,021,000us-gaap_ConstructionInProgressGross   979,000us-gaap_ConstructionInProgressGross
Capitalized interest expense 2,000us-gaap_InterestCostsCapitalized 22,000us-gaap_InterestCostsCapitalized  
Commitments for capital expenditures in progress $ 1,020,000cmt_CommitmentsForCapitalExpendituresInProgress   $ 1,682,000cmt_CommitmentsForCapitalExpendituresInProgress