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Commitments and Contingencies (Narrative) (Details)
R$ in Thousands, $ in Thousands, item in Millions
1 Months Ended 3 Months Ended 24 Months Ended
Feb. 28, 2018
USD ($)
Mar. 31, 2018
USD ($)
item
plaintiff
Mar. 31, 2017
USD ($)
Dec. 31, 2010
Mar. 31, 2018
BRL (R$)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Short-term Debt [Line Items]                
Environmental remediation accrued undiscounted liability           $ 132   $ 265
Number of vehicles the plaintiff states are effected | item   1            
Loss recoveries and insurance gain contingencies               1,644
Cash proceeds related to damaged inventory and incremental costs   $ 241 $ 500          
Cash proceeds within cash flows from investing activities   $ 1,403            
Product warranty and recall accrual           3,347   3,112
Royal v. Stoneridge, Inc. [Member]                
Short-term Debt [Line Items]                
Number of people the plaintiff states have damages | plaintiff   3            
Litigation liability           93   525
Royal v. Stoneridge, Inc, Attorney's Fees [Member]                
Short-term Debt [Line Items]                
Loss contingency, estimate of possible loss           375    
Legal settlement payment $ 375              
Royal v. Stoneridge, Inc, Awarded Incentive Payments [Member]                
Short-term Debt [Line Items]                
Legal settlement payment $ 15              
Accrued Expenses and Other Current Liabilities [Member]                
Short-term Debt [Line Items]                
Environmental remediation accrued undiscounted liability           132   253
Letter of Credit [Member]                
Short-term Debt [Line Items]                
Line of credit           1,489    
PST Eletronica Ltda [Member]                
Short-term Debt [Line Items]                
Litigation liability           0   0
Percentage of state value added tax       25.00%        
PST Eletronica Ltda [Member] | Civil, labor and other tax contingencies [Member]                
Short-term Debt [Line Items]                
Loss contingency, estimate of possible loss         R$ 38,100 $ 11,500 R$ 33,800 $ 10,200
Maximum [Member] | Royal v. Stoneridge, Inc. [Member]                
Short-term Debt [Line Items]                
Maximum loss per plaintiff   $ 5