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Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]          
Percentage ownership in consolidated subsidiary     74.00%    
Income (loss) from equity method investments $ 205 $ 99 $ 587 $ 396  
Noncontrolling interest 31,383   31,383   39,540
Less: income (loss) attributable to noncontrolling interest 1,160 466 (7,039) 1,260  
PST Eletronicaltda [Member]
         
Schedule of Equity Method Investments [Line Items]          
Percentage ownership in consolidated subsidiary     74.00%   74.00%
Noncontrolling interest 31,383 41,243 31,383 41,243  
Noncontroling interest increase (decrease)     (8,157) (2,623)  
Foreign currency translation adjustments     (1,118) (3,706)  
Noncontrolling interest, (decrease) from distributions to noncontrolling interest holders       (211)  
Less: income (loss) attributable to noncontrolling interest     (7,039) 1,264  
Comprehensive income (loss) related to noncontrolling interest (2,294) 214 (8,157) (2,442)  
Minda Stoneridge Instruments Ltd [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 49.00%   49.00%   49.00%
Equity method investments 6,564   6,564   5,981
Income (loss) from equity method investments $ 205 $ 99 $ 587 $ 396