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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income (Loss) From Equity Method Investments $ 760 $ 10,034 $ 10,346
Pst Eletronica Ltda [Member]
     
Equity Method Investment, Ownership Percentage 74.00% 74.00% 50.00%
Equity Method Investments   38,746  
Income (Loss) From Equity Method Investments   8,805 9,490
Noncontrolling Interest, Ownership Percentage by Parent 74.00% 74.00%  
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital     5,457
Minda Stoneridge Instruments Ltd [Member]
     
Equity Method Investment, Ownership Percentage 49.00% 49.00% 49.00%
Equity Method Investments 6,215 6,391  
Income (Loss) From Equity Method Investments $ 760 $ 1,229 $ 856