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Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Fixed interest rate   9.50%us-gaap_DerivativeFixedInterestRate            
Fair value adjustments of goodwill   $ 0sri_FairValueAdjustmentOfGoodwill $ 0sri_FairValueAdjustmentOfGoodwill          
Goodwill impairment charge (benefit) 51,458us-gaap_GoodwillImpairmentLoss              
Euro-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Gain (loss) on derivative instruments held for trading purposes, net 1,205us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
(638)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
           
Euro-Denominated and Sweedish Krona-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Gain (loss) on derivative instruments held for trading purposes, net     (492)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedAndSweedishKronaDenominatedForeignCurrencyForwardContractsMember
         
Copper Commodity [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Fixed price commodity contracts (in pounds) 317,000sri_FixedPriceCommodityContracts
/ us-gaap_DerivativeByNatureAxis
= sri_CopperCommodityMember
1,582,000sri_FixedPriceCommodityContracts
/ us-gaap_DerivativeByNatureAxis
= sri_CopperCommodityMember
           
Interest Rate Swap [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Gain on termination of Interest Rate Swap       371us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
       
Reduced interest expense as a result of swap 641sri_IncreaseDecreaseInDerivativeInterestExpenses
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
810sri_IncreaseDecreaseInDerivativeInterestExpenses
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
736sri_IncreaseDecreaseInDerivativeInterestExpenses
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
         
Senior Notes [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Face value of senior secured notes   175,000us-gaap_SecuredLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
175,000us-gaap_SecuredLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Estimated fair value of senior secured notes   190,100us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Variable interest rate in addition to LIBOR   7.20%us-gaap_DerivativeVariableInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Fixed interest rate   9.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Cash Flow Hedging [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Amount from cash flow hedge derivatives to be reclassified in the next year 1sri_AmountFromCashFlowHedgeDerivativesToBeReclassified
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
    1sri_AmountFromCashFlowHedgeDerivativesToBeReclassified
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  1sri_AmountFromCashFlowHedgeDerivativesToBeReclassified
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
   
Designated as Hedging Instrument [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts Euro Functional Currency [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 4,266invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsEuroFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsEuroFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  4,266invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsEuroFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  4,266invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsEuroFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Designated as Hedging Instrument [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts, Swedish Krona Functional Currency [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 11,718invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsSwedishKronaFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsSwedishKronaFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  11,718invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsSwedishKronaFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  11,718invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_U.s.DollarDenominatedForeignCurrencyForwardContractsSwedishKronaFunctionalCurrencyMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Designated as Hedging Instrument [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 10,282invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_MexicanPesoDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    10,282invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_MexicanPesoDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  10,282invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_MexicanPesoDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Forward Currency Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 26,267invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1] 45,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1]   26,267invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1]   26,267invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1]    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts   45,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_MexicanPesoDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
           
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Copper Commodity [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Fixed price commodity contracts (in pounds)   1,582,000sri_FixedPriceCommodityContracts
/ us-gaap_DerivativeByNatureAxis
= sri_CopperCommodityMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1]            
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts   45,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[1]            
Not Designated as Hedging Instrument [Member] | Forward Currency Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1] 13,335invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1]   3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1]   3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1]    
Not Designated as Hedging Instrument [Member] | Euro-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Notional amounts 3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
13,335invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  3,523invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sri_EuroDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Not Designated as Hedging Instrument [Member] | Copper Commodity [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Fixed price commodity contracts (in pounds) 317,000sri_FixedPriceCommodityContracts
/ us-gaap_DerivativeByNatureAxis
= sri_CopperCommodityMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1]              
Wiring [Member] | Not Designated as Hedging Instrument [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Gain recognized on dedesignation of hedge         320sri_GainRecognizedOnDedesignationOfHedge
/ us-gaap_DerivativeByNatureAxis
= sri_MexicanPesoDenominatedForeignCurrencyForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
     
Wiring [Member] | Not Designated as Hedging Instrument [Member] | Copper Commodity [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Gain on derivatives not designated as hedging instruments           77us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGain
/ us-gaap_DerivativeByNatureAxis
= sri_CopperCommodityMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
   
PST [Member]                
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                
Goodwill impairment charge (benefit) $ 51,458us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= sri_PstMember
    $ 27,960us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= sri_PstMember
$ 29,300us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= sri_PstMember
  $ (5,802)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= sri_PstMember
$ 23,498us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= sri_PstMember
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commoditycontract notional amounts are in pounds.