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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 57,303us-gaap_NetIncomeLoss $ 25,915us-gaap_NetIncomeLoss $ 62,303us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows:      
Depreciation and amortization 23,826us-gaap_DepreciationAmortizationAndAccretionNet 22,473us-gaap_DepreciationAmortizationAndAccretionNet 21,775us-gaap_DepreciationAmortizationAndAccretionNet
Non-cash deferred revenue (17,873)us-gaap_RecognitionOfDeferredRevenue (10,093)us-gaap_RecognitionOfDeferredRevenue (238)us-gaap_RecognitionOfDeferredRevenue
Loss on voluntary pension settlement 7,170us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Increase in inventory reserve 5,343us-gaap_InventoryWriteDown 2,329us-gaap_InventoryWriteDown 2,790us-gaap_InventoryWriteDown
Gain on sale of assets (1,099)us-gaap_GainsLossesOnSalesOfAssets (4,281)us-gaap_GainsLossesOnSalesOfAssets (5)us-gaap_GainsLossesOnSalesOfAssets
Allowance for doubtful accounts 61us-gaap_ProvisionForDoubtfulAccounts 433us-gaap_ProvisionForDoubtfulAccounts 193us-gaap_ProvisionForDoubtfulAccounts
Stock based compensation 5,002us-gaap_ShareBasedCompensation 2,825us-gaap_ShareBasedCompensation 1,802us-gaap_ShareBasedCompensation
Deferred income tax provision (16,025)cbm_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations 5,902cbm_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations (40,712)cbm_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
Equity in losses of partially-owned affiliates 4,623us-gaap_IncomeLossFromEquityMethodInvestments 2,262us-gaap_IncomeLossFromEquityMethodInvestments 1,766us-gaap_IncomeLossFromEquityMethodInvestments
Other 523us-gaap_OtherNoncashIncomeExpense 348us-gaap_OtherNoncashIncomeExpense 348us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:      
Trade receivables (8,955)us-gaap_IncreaseDecreaseInAccountsReceivable (27,707)us-gaap_IncreaseDecreaseInAccountsReceivable (6,310)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (9,062)us-gaap_IncreaseDecreaseInInventories (19,328)us-gaap_IncreaseDecreaseInInventories (10,295)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (5,766)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (2,651)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (188)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and other current liabilities 12,369us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 10,107us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 3,134us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 11,773us-gaap_IncreaseDecreaseInDeferredRevenue 18,644us-gaap_IncreaseDecreaseInDeferredRevenue 10,748us-gaap_IncreaseDecreaseInDeferredRevenue
Other non-current assets and liabilities (2,387)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet 11,229us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet 182us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Discontinued operations:      
Net cash used in discontinued operations (1,858)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (1,533)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (3,747)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities 64,968us-gaap_NetCashProvidedByUsedInOperatingActivities 36,874us-gaap_NetCashProvidedByUsedInOperatingActivities 43,546us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Capital expenditures (23,323)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (57,320)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (18,156)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets 2,355us-gaap_ProceedsFromSalesOfAssetsInvestingActivities 2,378us-gaap_ProceedsFromSalesOfAssetsInvestingActivities 16us-gaap_ProceedsFromSalesOfAssetsInvestingActivities
Advances to partially-owned affiliates (1,404)us-gaap_PaymentsForAdvanceToAffiliate (1,655)us-gaap_PaymentsForAdvanceToAffiliate (2,047)us-gaap_PaymentsForAdvanceToAffiliate
Acquisition of business and equity investment, net of cash acquired (2,426)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Other 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 5us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (24,798)us-gaap_NetCashProvidedByUsedInInvestingActivities (56,597)us-gaap_NetCashProvidedByUsedInInvestingActivities (20,182)us-gaap_NetCashProvidedByUsedInInvestingActivities
Long-term debt activity (including current portion):      
Borrowings 25,750us-gaap_ProceedsFromIssuanceOfLongTermDebt 70,950us-gaap_ProceedsFromIssuanceOfLongTermDebt 5,500us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments (45,000)us-gaap_RepaymentsOfLongTermDebt (55,700)us-gaap_RepaymentsOfLongTermDebt (39,500)us-gaap_RepaymentsOfLongTermDebt
Proceeds from stock options exercised 4,203us-gaap_ProceedsFromStockOptionsExercised 3,224us-gaap_ProceedsFromStockOptionsExercised 1,355us-gaap_ProceedsFromStockOptionsExercised
Other 522us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (301)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (22)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash (used in)/provided by financing activities (14,525)us-gaap_NetCashProvidedByUsedInFinancingActivities 18,173us-gaap_NetCashProvidedByUsedInFinancingActivities (32,667)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (2,872)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 744us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 933us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase/(decrease) in cash and cash equivalents 22,773us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (806)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (8,370)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 22,745us-gaap_CashAndCashEquivalentsAtCarryingValue 23,551us-gaap_CashAndCashEquivalentsAtCarryingValue 31,921us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 45,518us-gaap_CashAndCashEquivalentsAtCarryingValue 22,745us-gaap_CashAndCashEquivalentsAtCarryingValue 23,551us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure:      
Interest paid, net of capitalized interest 2,068us-gaap_InterestPaidNet 2,325us-gaap_InterestPaidNet 2,556us-gaap_InterestPaidNet
Income taxes paid, net of refunds received $ 6,725us-gaap_IncomeTaxesPaidNet $ 7,211us-gaap_IncomeTaxesPaidNet $ 5,068us-gaap_IncomeTaxesPaidNet