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Fair Value of Financial Instruments (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair value of financial instruments:      
Amortization of gain (loss) on discontinued hedges during next 12 months $ 21,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet    
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net Of Tax (14,000)cmt_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNetOfTax    
Swap | Interest rate swap | Interest expense | Not designated as hedging instrument      
Fair value of financial instruments:      
Amount of Realized/Unrealized Gain (Loss) Recognized in Income on Derivatives 46,000us-gaap_UnrealizedGainLossOnDerivatives
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73,000us-gaap_UnrealizedGainLossOnDerivatives
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36,000us-gaap_UnrealizedGainLossOnDerivatives
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Level 2 | Swap | Interest rate swap | Recurring | Interest rate swaps | Not designated as hedging instrument      
Fair value of financial instruments:      
Derivatives not designated as hedging instruments, interest rate swap liabilities $ 37,000us-gaap_DerivativeLiabilities
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$ 103,000us-gaap_DerivativeLiabilities
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