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AOCI (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 4,872,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 3,187,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income before reclassifications	(2,726,000)cmt_OtherComprehensiveIncomeBeforeReclassifications	2,917,000cmt_OtherComprehensiveIncomeBeforeReclassifications
Amounts reclassified from accumulated other comprehensive income, before tax	(428,000)cmt_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeBeforeTax	(259,000)cmt_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeBeforeTax
Other Comprehensive Income (Loss), Tax	1,112,000us-gaap_OtherComprehensiveIncomeLossTax	(973,000)us-gaap_OtherComprehensiveIncomeLossTax
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,830,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	4,872,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Derivative [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(30,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(54,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other comprehensive income before reclassifications	0cmt_OtherComprehensiveIncomeBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	0cmt_OtherComprehensiveIncomeBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	21,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	36,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other Comprehensive Income (Loss), Tax	(7,000)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(12,000)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Accumulated Other Comprehensive Income (Loss), Net of Tax	(16,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(30,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other Postretirement Benefit Plan, Defined Benefit [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,902,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember	3,241,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other comprehensive income before reclassifications	(2,726,000)cmt_OtherComprehensiveIncomeBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember	2,917,000cmt_OtherComprehensiveIncomeBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(449,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember	(295,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Comprehensive Income (Loss), Tax	1,119,000us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember	(961,000)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 2,846,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember	$ 4,902,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

-Paragraph 4C

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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