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Discontinued Operations Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales | $ 162,825 us-gaap_SalesRevenueNet |  | $ 161,331 us-gaap_SalesRevenueNet |
Cost of goods sold | 119,177 us-gaap_CostOfGoodsSold |  | 113,193 us-gaap_CostOfGoodsSold |
Selling, general and administrative | 30,742 us-gaap_SellingGeneralAndAdministrativeExpense |  | 30,767 us-gaap_SellingGeneralAndAdministrativeExpense |
Interest expense, net | 1,278 sri_InterestExpenseNet |  | 4,929 sri_InterestExpenseNet |
Other (income) expense, net | (213)us-gaap_OtherNonoperatingIncomeExpense |  | 1,915 us-gaap_OtherNonoperatingIncomeExpense |
Income (loss) from discontinued operations, net of tax |  |  | 1,053 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |
Loss on disposal, net of tax | (168)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | (96)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Income (loss) from discontinued operations | (168)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 957 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Write-down of asset group to fair value less cost to sell | (132)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |  |  |
Transaction costs related to Wiring sale | 46 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense |  | 148 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense |
Wiring [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales |  |  | 75,059 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Cost of goods sold |  |  | 68,407 us-gaap_CostOfGoodsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Selling, general and administrative |  |  | 5,370 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Interest expense, net |  |  | 11 sri_InterestExpenseNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Other (income) expense, net |  |  | 31 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Income (loss) from operations of discontinued operations before income taxes |  |  | 1,240 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [1]
Income tax provision on discontinued operations |  |  | (187)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Income (loss) from discontinued operations, net of tax |  |  | 1,053 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [2]
Gross Loss on disposal | (178)sri_GrossLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3] | (148)sri_GrossLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3]
Income tax benefit on loss on disposal | 10 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | 52 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Loss on disposal, net of tax | (168)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | (96)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Income (loss) from discontinued operations | (168)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | 957 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Management fees |  |  | $ 1,858 us-gaap_AssetManagementFees1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
[1] | The operations of the Wiring business were included only for the three months ended March 31, 2014 as the sale was completed on August 1, 2014.
[2] | Management fees, which had been reported in the Wiring business in prior periods, of $1,858 for the threemonths ended March 31, 2014 have been excluded as they were not directly attributable to the business.
[3] | Included in loss on disposal for the three months ended March 31, 2015 and 2014 were transaction costs of$46 and $148, respectively, and a working capital adjustment of $132 for the three months ended March 31,2015.

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- Definition Interest expense incurred and charged against earnings during the reporting period on all debt, including interest on short-term obligations and long-term debt, and amortization of debt issuance costs and debt discounts. Interest expense is net of interest income earned during the reporting period. + References No definition available. + Details
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