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Fair Value of Financial Instruments (Foreign Currency Forward Contracts) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Gains (losses) on intercompany receivables | $ (700,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (300,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
Derivative Asset [Abstract] |  |  |
Fair value, assets | 9,292,000 us-gaap_DerivativeFairValueOfDerivativeAsset |  | 6,211,000 us-gaap_DerivativeFairValueOfDerivativeAsset
Fair value, liabilities | (1,034,000)us-gaap_DerivativeAssetFairValueGrossLiability |  | (1,032,000)us-gaap_DerivativeAssetFairValueGrossLiability
Derivative Assets (Liabilities), at Fair Value, Net | 8,258,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet |  | 5,179,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Foreign Currency Forward Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Forward contracts not designated as hedging instruments net realized gains (losses) | 600,000 us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | 200,000 us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivative Asset [Abstract] |  |  |
Fair value, assets | 9,291,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 6,167,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Fair value, liabilities | (984,000)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | (971,000)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative Assets (Liabilities), at Fair Value, Net | 8,307,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 5,196,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 35,800,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivative Asset [Abstract] |  |  |
Fair value, assets | 1,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 44,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Fair value, liabilities | (50,000)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | (61,000)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative Assets (Liabilities), at Fair Value, Net | (49,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | (17,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 77,800,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |
Cash flow hedges realized gains (losses) | 2,700,000 cnmd_CashFlowHedgeGainLossReclassifiedToNetSalesOrCostOfSalesNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | (100,000)cnmd_CashFlowHedgeGainLossReclassifiedToNetSalesOrCostOfSalesNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in the next fiscal year | $ 5,200,000 us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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