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Derivatives - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Minimum      
Derivative [Line Items]      
Percentage of forcasted transactions with currency rate exposure 50.00%ivc_DerivativePercentageOfForcastedTransactionsWithCurrencyRateExposure
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Derivative [Line Items]      
Percentage of forcasted transactions with currency rate exposure 90.00%ivc_DerivativePercentageOfForcastedTransactionsWithCurrencyRateExposure
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Foreign exchange forward      
Derivative [Line Items]      
Notional amount of derivatives, matured during period $ 157,121ivc_NotionalAmountOfDerivativesMaturedDuringPeriod
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
$ 182,213ivc_NotionalAmountOfDerivativesMaturedDuringPeriod
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
 
Gain (Loss) 338us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
(271)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
3,763us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Interest expense | Interest rate swap      
Derivative [Line Items]      
Gain on derivative   337us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
600us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Loss on derivative (12)us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
   
Selling, general and administrative expense | Foreign exchange forward      
Derivative [Line Items]      
Gain on derivative   370us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
1,159us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Loss on derivative (1,458)us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
   
Cash Flow Hedging      
Derivative [Line Items]      
Gain (Loss) 338us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
(271)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
3,763us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Cash Flow Hedging | Net sales      
Derivative [Line Items]      
Gain on derivative   432us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
 
Loss on derivative (657)us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
   
Cash Flow Hedging | Cost of products sold      
Derivative [Line Items]      
Gain on derivative 995us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
   
Loss on derivative   $ (703)us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember