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Summary of Significant Accounting Policies (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]      
Foreign currency translation, Beginning balance $ (30,335)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ (12,410)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Foreign currency translation, Other comprehensive income (loss) before reclassifications (18,002)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (17,925)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax  
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss 2,734us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax    
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax (15,268)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (17,925)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (10,502)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Foreign currency translation, Ending balance (45,603)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (30,335)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (12,410)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Unrealized gain (loss) on hedging activities, Beginning balance (111)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 2,140us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax (454)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (325)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax  
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss 566us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (1,926)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax  
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax 112us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (2,251)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 9,862us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Unrealized gain (loss) on hedging activities, Ending balance 1us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (111)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 2,140us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Benefit plan liability, Beginning balance (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss 141us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax    
Benefit plan liability, Other comprehensive income (loss) 141us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax   (27)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Benefit plan liability, Ending balance 129us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Total, Other comprehensive income (loss) before reclassifications (18,456)sri_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax (18,250)sri_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax  
Total, Amounts reclassified from accumulated other comprehensive loss 3,441sri_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax (1,926)sri_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax  
Other comprehensive income (loss), net of tax (15,015)us-gaap_OtherComprehensiveIncomeLossNetOfTax (20,176)us-gaap_OtherComprehensiveIncomeLossNetOfTax  
Accumulated other comprehensive income (loss), net of tax, total $ (45,473)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (30,458)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (10,282)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax