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Investments (Narrative) (Details)
BRL in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
BRL
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]              
Income (loss) from equity method investments $ 153 $ 143 $ 296 $ 332      
Noncontrolling interest           $ 14,171 $ 13,310
Less: income (loss) attributable to noncontrolling interest (576) (596) $ (1,706) (1,005)      
PST Eletronicaltda [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage ownership in consolidated subsidiary     74.00%        
Noncontrolling interest   18,353   18,353   14,171  
Foreign currency translation adjustments     $ 2,567 (3,192)      
Less: income (loss) attributable to noncontrolling interest     (1,706) (1,005)      
Comprehensive income (loss) related to noncontrolling interest 801 32 861 (4,197)      
Dividends payable         BRL 10,842 $ 3,378  
Minda Stoneridge Instruments Ltd [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage         49.00% 49.00%  
Equity method investments           $ 7,085 $ 6,929
Income (loss) from equity method investments $ 153 $ 143 $ 296 $ 332