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Selected Quarterly Financial Data (Unaudited) (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 7,434,000 us-gaap_RestructuringCharges |  |
Costs associated with patent dispute and other matters | 100,000 us-gaap_LegalFees |  | 1,400,000 us-gaap_LegalFees |  |  |  |  |  | 3,374,000 us-gaap_LegalFees |  | 1,555,000 us-gaap_LegalFees
State income taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Deferred income taxes |  |  |  |  |  |  |  |  | (284,000)us-gaap_DeferredIncomeTaxExpenseBenefit | 7,218,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 12,946,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Costs associated with shareholder activism |  | 2,400,000 us-gaap_ProfessionalFees | 900,000 us-gaap_ProfessionalFees | 600,000 us-gaap_ProfessionalFees |  |  |  |  | 3,966,000 us-gaap_ProfessionalFees | 0 us-gaap_ProfessionalFees | 0 us-gaap_ProfessionalFees
Loss on early extinguishment of debt |  |  |  |  |  |  |  | 300,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 263,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
Settlement expense |  |  |  |  | 1,400,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 |  |  |  | 0 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 | 1,443,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 | 0 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Executive Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 12,546,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 5,612,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 8,626,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 7,052,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cost of Sales [Member] | Facility Consolidation Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 1,900,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 1,400,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 1,400,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 900,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 2,100,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 1,100,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 1,600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 1,600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 5,612,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 6,489,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember | 7,052,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_FacilityConsolidationCostsMember
Cost of Sales [Member] | Termination of a product offering [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 2,100,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_TerminationOfProductOfferingMember |  |  | 0 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_TerminationOfProductOfferingMember | 2,137,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_TerminationOfProductOfferingMember | 0 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_TerminationOfProductOfferingMember
Other Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 15,900,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 8,750,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 6,497,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Other Expense [Member] | Administrative consolidation costs [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 1,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 700,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 2,400,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 3,100,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 1,600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 1,600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 3,354,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 8,750,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember | 6,497,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_AdministrativeConsolidationCostsMember
Other Expense [Member] | Executive Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 1,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember | 11,000,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember |  |  |  |  |  |  | 12,546,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember | 0 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember | 0 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / us-gaap_RestructuringCostAndReserveAxis = cnmd_ExecutiveRestructuringMember
Distributor [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs associated with purchase |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_DistributorMember | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_DistributorMember | 704,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_DistributorMember
Business [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs associated with purchase | 300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_BusinessMember | 300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_BusinessMember |  |  |  |  |  |  | 722,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_BusinessMember | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_BusinessMember | 1,194,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / cnmd_AcquisitionByTypeAxis = cnmd_BusinessMember
Patent Infringement [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs associated with patent dispute and other matters |  |  |  | 1,900,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 1,000,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 1,500,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 500,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 200,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 1,900,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember | 3,206,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember |
Litigation Settlement, Expense |  |  |  | 900,000 us-gaap_LitigationSettlementExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember |  |  |  |  | 900,000 us-gaap_LitigationSettlementExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_PatentInfringementMember |  |
Legal Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs associated with patent dispute and other matters |  |  |  |  |  |  |  |  | 1,500,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = cnmd_LegalFeesMember |  |
NEW YORK |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal tax benefit |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes / us-gaap_StatementGeographicalAxis = stpr_NY |  |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes / us-gaap_StatementGeographicalAxis = stpr_NY |  |
Deferred income taxes |  |  |  | $ 2,300,000 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = stpr_NY |  |  |  |  | $ 2,300,000 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = stpr_NY |  |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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