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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Income (loss) before income taxes:                      
Domestic                 $ 1,635us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 5,771us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (1,511)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign                 (54,695)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 17,555us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (2,299)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) before income taxes from continuing operations                 (53,060)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 23,326us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (3,810)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes:                      
Federal                         
State and foreign                 1,382sri_CurrentStateAndForeignIncomeTaxExpenseBenefit 5,878sri_CurrentStateAndForeignIncomeTaxExpenseBenefit 2,700sri_CurrentStateAndForeignIncomeTaxExpenseBenefit
Total current provision                 1,382us-gaap_CurrentIncomeTaxExpenseBenefit 5,878us-gaap_CurrentIncomeTaxExpenseBenefit 2,700us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:                      
Federal                     98us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and foreign                 (3,238)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (3,081)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (2,831)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Total                 (3,238)us-gaap_DeferredIncomeTaxExpenseBenefit (3,081)us-gaap_DeferredIncomeTaxExpenseBenefit (2,733)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit), Total $ (1,066)us-gaap_IncomeTaxExpenseBenefit $ (1,174)us-gaap_IncomeTaxExpenseBenefit $ 90us-gaap_IncomeTaxExpenseBenefit $ 294us-gaap_IncomeTaxExpenseBenefit $ 537us-gaap_IncomeTaxExpenseBenefit $ 794us-gaap_IncomeTaxExpenseBenefit $ 775us-gaap_IncomeTaxExpenseBenefit $ 691us-gaap_IncomeTaxExpenseBenefit $ (1,856)us-gaap_IncomeTaxExpenseBenefit $ 2,797us-gaap_IncomeTaxExpenseBenefit $ (33)us-gaap_IncomeTaxExpenseBenefit