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Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income (loss) from equity method investments $ 99 $ 207 $ 396 $ 443  
Equity method investment, ownership percentage 74.00%   74.00%    
Noncontrolling interest 41,423   41,423   44,081
Net income attributable to noncontrolling interest 466 170 1,260 (1,703)  
Comprehensive (income) loss attributable to noncontrolling interest 466 170 1,260 (1,703)  
PST Eletrnica Ltda. [Member]
         
Equity method investment, ownership percentage 74.00% 74.00% 74.00% 74.00%  
Noncontrolling interest, period increase (decrease)     2,653    
Noncontrolling interest 41,243   41,243    
Net income attributable to noncontrolling interest     1,264    
Noncontrolling interest, decrease from distributions to noncontrolling interest holders     211    
Foreign currency translation adjustment to noncontrolling interest     3,706    
Comprehensive (income) loss attributable to noncontrolling interest (214) (85) 2,442 4,893  
Minda Stoneridge Instruments Ltd [Member]
         
Income (loss) from equity method investments 99 207 396 443  
Equity method investments $ 5,817   $ 5,817   $ 6,215
Equity method investment, ownership percentage 49.00%   49.00%