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Equity - Anti-takeover Measures and Restrictions on Transfer (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Jul. 18, 2007
Equity:      
Number of rights granted per share of common stock owned     1cmt_ClassOfWarrantOrRightNumberOfWarrantsOrRightsGrantedPerCommonShareOwned
Ownership interest limit for anti-takeover measure     15.00%cmt_ShareholdersEquityOwnershipInterestLimitToInitateAntiTakeoverMeasure
Preferred stock, par value (USD per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare  
Series A Junior Preferred Preferred Stock      
Equity:      
Number of securities called by right     0.001us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Preferred stock, par value (USD per share)     0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember