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Shareholders' Equity (Employee Plan) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for share-based compensation plans 6,800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Unrecognized compensation cost 9.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Employee Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for share-based compensation plans 1,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Minimum percent of salary employees can invest 1.00%cnmd_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Maximum percent of salary employees can invest 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Purchase prices percent of fair market value 95.00%cnmd_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountedPriceAsPercentageOfMarketPriceExerciseDate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Number of shares issued under Plan 13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember