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Investments (Narrative) (Details) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 36 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 PST Eletronicaltda [Member] | Dec. 31, 2014 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2012 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2014 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2014 PST Eletronicaltda [Member] BRL | Dec. 31, 2013 PST Eletronicaltda [Member] BRL | Dec. 31, 2010 PST Eletronicaltda [Member] | Dec. 31, 2014 Minda Stoneridge Instruments Ltd [Member] USD ($) | Dec. 31, 2013 Minda Stoneridge Instruments Ltd [Member] USD ($) | Dec. 31, 2012 Minda Stoneridge Instruments Ltd [Member] USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 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
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 | 74.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,653 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | $ 5,981 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  |  |  |  | 815 us-gaap_IncomeLossFromEquityMethodInvestments | 476 us-gaap_IncomeLossFromEquityMethodInvestments | 760 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |  |  |  |  |  | 815 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | 476 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | 760 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember
Noncontrolling interest | 22,550 us-gaap_MinorityInterest |  |  |  |  |  |  |  | 39,540 us-gaap_MinorityInterest |  |  |  | 22,550 us-gaap_MinorityInterest | 39,540 us-gaap_MinorityInterest |  |  | 22,550 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 39,540 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  | 22,550 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |
Noncontroling interest increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,990)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (4,537)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (4,651)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,507)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (5,706)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (3,918)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |
Noncontrolling interest, (decrease) from distributions to noncontrolling interest holders |  |  |  |  |  |  |  |  |  |  |  |  |  | (212)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  | (212)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest | (6,444)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 1,160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (7,221)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (978)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 117 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 466 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 634 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (13,483)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1,377 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,613)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | (13,483)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 1,377 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | (733)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |
Comprehensive income (loss) related to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | (16,990)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (4,325)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (4,651)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest |  | 16,990 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |  |  |  |  |  |
Dividends payable to noncontrolling interest and former shareholder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,082 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | $ 5,654 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  | $ 4,082 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 10,842 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 13,246 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |
[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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