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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income (Loss) From Equity Method Investments $ 207 $ 1,353 $ 443 $ 5,077  
Pst Eletronica Ltda [Member]
         
Equity Method Investment, Ownership Percentage   50.00%   50.00%  
Income (Loss) From Equity Method Investments   964   4,068  
Noncontrolling Interest, Ownership Percentage by Parent 74.00%   74.00%    
Minda Stoneridge Instruments Ltd [Member]
         
Equity Method Investment, Ownership Percentage 49.00%   49.00%    
Equity Method Investments 6,777   6,777   6,391
Income (Loss) From Equity Method Investments $ 207 $ 389 $ 443 $ 1,009