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Commitments and Contingencies (Narrative) (Details)
R$ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
BRL (R$)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Short-term Debt [Line Items]              
Environmental remediation accrued undiscounted liability         $ 157   $ 265
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 $ 0 $ 1,403          
Product warranty and recall accrual         3,261   3,112
Accrued Expenses and Other Current Liabilities [Member]              
Short-term Debt [Line Items]              
Environmental remediation accrued undiscounted liability         157   253
Letter of Credit [Member]              
Short-term Debt [Line Items]              
Line of credit         1,489    
PST Eletronica Ltda [Member] | Civil, labor and other tax contingencies [Member]              
Short-term Debt [Line Items]              
Loss contingency, estimate of possible loss       R$ 28,700 $ 7,400 R$ 33,800 $ 10,200