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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 9 Months Ended | 0 Months Ended | 36 Months Ended | 0 Months Ended | 7 Months Ended | 5 Months Ended |  |  |
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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 | Sep. 30, 2014 | Dec. 31, 2011 | Dec. 31, 2014 | Aug. 01, 2014 | May 26, 2014 | Jul. 31, 2014 | Dec. 31, 2014 | Oct. 18, 2014 | Oct. 04, 2010 | Dec. 31, 2010
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,299,000 us-gaap_CostOfGoodsSoldDepreciation | $ 24,099,000 us-gaap_CostOfGoodsSoldDepreciation | $ 23,674,000 us-gaap_CostOfGoodsSoldDepreciation |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill |  |  |  |  |  |  |  |  |  |
Dividend from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 212,000 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest | (6,444,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 1,160,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (7,221,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (978,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 117,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 466,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 634,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 160,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (13,483,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1,377,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,613,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized | 10,067,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |  |  |  |  |  |  |  | 11,584,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |  |  |  | 10,067,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized | 11,584,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |  |  |  | 10,067,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |  |  |  | 10,067,000 us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized |  |  |
Proceeds from sale of Wiring business |  |  |  |  |  |  |  |  |  |  |  |  | 71,386,000 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 51,458,000 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  |  |  |  |  |  |  |  |  |  | 664,000 us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,078,000 us-gaap_Goodwill |  |  |  |  |  |  |  | 54,348,000 us-gaap_Goodwill |  |  |  | 1,078,000 us-gaap_Goodwill | 54,348,000 us-gaap_Goodwill | 62,208,000 us-gaap_Goodwill |  |  | 1,078,000 us-gaap_Goodwill |  |  |  | 1,078,000 us-gaap_Goodwill |  |  |
Intangible assets, net | 56,637,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  |  |  |  |  | 68,498,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 56,637,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 68,498,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 56,637,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 56,637,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 4,784,000 us-gaap_AdjustmentForAmortization | 5,187,000 us-gaap_AdjustmentForAmortization | 5,731,000 us-gaap_AdjustmentForAmortization |  |  |  |  |  |  |  |  |  |
Intangible assets amortization expense estimated for the next 5 years | 4,500,000 sri_FiniteLivedIntangibleAssetsAmortizationExpenseOneThroughFiveYears |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 sri_FiniteLivedIntangibleAssetsAmortizationExpenseOneThroughFiveYears |  |  |  |  | 4,500,000 sri_FiniteLivedIntangibleAssetsAmortizationExpenseOneThroughFiveYears |  |  |  | 4,500,000 sri_FiniteLivedIntangibleAssetsAmortizationExpenseOneThroughFiveYears |  |  |
Intangible assets, weighted-average remaining amortization period, years |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance | 67,907,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |  |  |  |  | 71,827,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 67,907,000 us-gaap_DeferredTaxAssetsValuationAllowance | 71,827,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 67,907,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 67,907,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |
Research and development expense |  |  |  |  |  |  |  |  |  |  |  |  | 41,609,000 us-gaap_ResearchAndDevelopmentExpense | 40,372,000 us-gaap_ResearchAndDevelopmentExpense | 38,945,000 us-gaap_ResearchAndDevelopmentExpense |  |  |  |  |  |  |  |  |  |
Research and development expense percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.30%sri_ResearchAndDevelopmentExpensePercentage | 6.10%sri_ResearchAndDevelopmentExpensePercentage | 6.40%sri_ResearchAndDevelopmentExpensePercentage |  |  |  |  |  |  |  |  |  |
Research and development expense reimbursed |  |  |  |  |  |  |  |  |  |  |  |  | 12,319,000 us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned | 16,982,000 us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned | 16,369,000 us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 5,406,000 us-gaap_ShareBasedCompensation | 4,974,000 us-gaap_ShareBasedCompensation | 4,890,000 us-gaap_ShareBasedCompensation |  |  |  |  |  |  |  |  |  |
Share-based compensation expense capitalized as inventory |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 0 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 0 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, average price per share |  |  |  |  |  |  |  |  | $ 15.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |  | $ 15.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 850,000 us-gaap_AmortizationOfFinancingCosts | 908,000 us-gaap_AmortizationOfFinancingCosts | 855,000 us-gaap_AmortizationOfFinancingCosts |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net | 1,767,000 us-gaap_DeferredFinanceCostsNet |  |  |  |  |  |  |  | 1,168,000 us-gaap_DeferredFinanceCostsNet |  |  |  | 1,767,000 us-gaap_DeferredFinanceCostsNet | 1,168,000 us-gaap_DeferredFinanceCostsNet |  |  |  | 1,767,000 us-gaap_DeferredFinanceCostsNet |  |  |  | 1,767,000 us-gaap_DeferredFinanceCostsNet | 597,000 us-gaap_DeferredFinanceCostsNet |  |
Accumulated goodwill | 300,083,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |  |  |  |  |  |  | 248,625,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |  |  | 300,083,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 248,625,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |  |  | 300,083,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |  |  | 300,083,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |  |
Goodwill impairment loss (gain) attributable to noncontrolling interest | 6,142,000 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty and recall accrual | 1,204,000 us-gaap_ProductWarrantyAccrualNoncurrent |  |  |  |  |  |  |  | 1,019,000 us-gaap_ProductWarrantyAccrualNoncurrent |  |  |  | 1,204,000 us-gaap_ProductWarrantyAccrualNoncurrent | 1,019,000 us-gaap_ProductWarrantyAccrualNoncurrent |  |  |  | 1,204,000 us-gaap_ProductWarrantyAccrualNoncurrent |  |  |  | 1,204,000 us-gaap_ProductWarrantyAccrualNoncurrent |  |  |
Inventory amount, FIFO | 34,636,000 us-gaap_FIFOInventoryAmount |  |  |  |  |  |  |  | 33,220,000 us-gaap_FIFOInventoryAmount |  |  |  | 34,636,000 us-gaap_FIFOInventoryAmount | 33,220,000 us-gaap_FIFOInventoryAmount |  |  |  | 34,636,000 us-gaap_FIFOInventoryAmount |  |  |  | 34,636,000 us-gaap_FIFOInventoryAmount |  |  |
Inventory amount, weighted average cost | 36,617,000 us-gaap_WeightedAverageCostInventoryAmount |  |  |  |  |  |  |  | 46,308,000 us-gaap_WeightedAverageCostInventoryAmount |  |  |  | 36,617,000 us-gaap_WeightedAverageCostInventoryAmount | 46,308,000 us-gaap_WeightedAverageCostInventoryAmount |  |  |  | 36,617,000 us-gaap_WeightedAverageCostInventoryAmount |  |  |  | 36,617,000 us-gaap_WeightedAverageCostInventoryAmount |  |  |
Foreign currency transaction gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (1,212,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (2,109,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (3,979,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |  |  |  |  |  |  |
Noncontrolling interest | 22,550,000 us-gaap_MinorityInterest |  |  |  |  |  |  |  | 39,540,000 us-gaap_MinorityInterest |  |  |  | 22,550,000 us-gaap_MinorityInterest | 39,540,000 us-gaap_MinorityInterest |  |  |  | 22,550,000 us-gaap_MinorityInterest |  |  |  | 22,550,000 us-gaap_MinorityInterest |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 212,000 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | (13,483,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,377,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,613,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  |  |  |  |  |  |  |  |  |  | 664,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |  |  |  |  |  | 604,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |  | 1,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 604,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 598,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  | 1,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |  | 1,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |
PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge (benefit) | 27,960,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | (5,802,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | 29,300,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  | 51,458,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  | 23,498,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 53,744,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  | 53,744,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | 61,610,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss (gain) attributable to noncontrolling interest | 6,142,000 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | (1,274,000)sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | 6,436,000 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  | 11,304,000 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  | 5,162,000 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%sri_DebtInstrumentUnamortizedDiscountPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 2.50%sri_DebtInstrumentUnamortizedDiscountPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument, interest rate, effective percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Equity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive shares outstanding weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.73 sri_AntidilutiveSharesOutstandingWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember | $ 12.20 sri_AntidilutiveSharesOutstandingWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember | 59,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember |  |  |  |  |  |  |  |  |  |
Long Term Cash Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 243,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember | 155,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember | 47,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember |  |  |  |  |  |  |  |  |  |
Customer Lists [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 26,999,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |  |  |  |  |  | 32,705,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |  | 26,999,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 32,705,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |  | 26,999,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |  | 26,999,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |
Customer Lists [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 26,625,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |  |  | 26,625,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  | 26,625,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  | 26,625,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |
Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 18,886,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |  |  |  |  | 22,629,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  | 18,886,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 22,629,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  | 18,886,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  | 18,886,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Trademarks [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 18,848,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |  |  | 18,848,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  | 18,848,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  | 18,848,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |
Developed Technology Rights [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 10,752,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |  |  | 10,752,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  | 10,752,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  | 10,752,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |
PST Eletronicaltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember
Percentage ownership in consolidated subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 74.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |
Increase in equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00%sri_IncreaseDecreaseInEquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |
Noncontroling interest increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  | (16,990,000)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (4,537,000)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (4,651,000)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |  |  |
Unfavorable change in foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  | 3,507,000 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 5,706,000 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 3,918,000 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |  |  |
Dividend from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 212,000 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | (13,483,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 1,377,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (733,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |  |  |
Noncontrolling interest | 22,550,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  | 39,540,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  | 22,550,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 39,540,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  | 22,550,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  | 22,550,000 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  |  |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |
Equity method investments | 6,653,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  |  |  |  |  | 5,981,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  | 6,653,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | 5,981,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  | 6,653,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |  | 6,653,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Wiring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of Wiring business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,386,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | 65,700,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |  |
Intercompany sales to Wiring |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,353,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | 30,857,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |  |  | 17,448,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |
Intercompany purchases from Wiring |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,593,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | 5,670,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |  |  | 4,025,000 us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |
Wiring [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Post-disposition purchases from Wiring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269,000 sri_PostDispositionPurchasesFromWiring / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |
Post-disposition sales to Wiring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,230,000 sri_PostDispositionSalesToWiring / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |
Performance Based Right to Received Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation vested in period, fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 374,400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  |  |  |  |  |  |  |  |  |  |
Performance Based Right to Received Common Shares [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | 466,650 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  |  |  |  |  |  | 663,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  |  | 466,650 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember | 663,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember | 635,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  | 466,650 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  |  | 466,650 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = sri_PerformanceBasedRightToReceivedCommonSharesMember |  |  |
[1] | Goodwill impairment of $29,300, $(5,802), and $27,960 related to the PST segment was recorded for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively, of which $6,436, $(1,274) and $6,142 was attributable to noncontrolling interest.

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