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Financial Instruments and Fair Value Measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financial assets carried at fair value:    
Forward currency contracts $ 1,510us-gaap_ForeignCurrencyContractAssetFairValueDisclosure $ 479us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Total financial assets carried at fair value 1,510us-gaap_AssetsFairValueDisclosure 479us-gaap_AssetsFairValueDisclosure
Financial liabilities carried at fair value:    
Forward currency contracts 579us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure 491us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Fixed price commodity contracts   69sri_FixedPriceContractLiabilitiesFairValueDisclosure
Total financial liabilities carried at fair value 579us-gaap_LiabilitiesFairValueDisclosure 560us-gaap_LiabilitiesFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]    
Financial assets carried at fair value:    
Interest rate swap contract    [1]  
Forward currency contracts    [1]  
Total financial assets carried at fair value    [1]  
Financial liabilities carried at fair value:    
Forward currency contracts    [1]  
Fixed price commodity contracts    [1]  
Total financial liabilities carried at fair value    [1]  
Fair Value, Inputs, Level 2 [Member]    
Financial assets carried at fair value:    
Interest rate swap contract    [2]  
Forward currency contracts 1,510us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Total financial assets carried at fair value 1,510us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Financial liabilities carried at fair value:    
Forward currency contracts 579us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Fixed price commodity contracts    [2]  
Total financial liabilities carried at fair value 579us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Fair Value, Inputs, Level 3 [Member]    
Financial assets carried at fair value:    
Interest rate swap contract    [3]  
Forward currency contracts    [3]  
Total financial assets carried at fair value    [3]  
Financial liabilities carried at fair value:    
Forward currency contracts    [3]  
Fixed price commodity contracts    [3]  
Total financial liabilities carried at fair value    [3]  
[1] Fair values estimated using Level 1 inputs, which consist of quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. The Company did not have any recurring fair value estimates using Level 1 inputs at March 31, 2015 or December 31, 2014.
[2] Fair values estimated using Level 2 inputs, other than quoted prices, that are observable for the asset or liability, either directly or indirectly and include among other things, quoted prices for similar assets or liabilities in markets that are active or inactive as well as inputs other than quoted prices that are observable. For forward currency and fixed price commodity, inputs include foreign currency exchange rates and commodity indexes.
[3] Fair values estimated using Level 3 inputs consist of significant unobservable inputs. The Company did not have any recurring fair value estimates using Level 3 inputs at March 31, 2015 or December 31, 2014