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Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 18 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
PST Eletronicaltda [Member]
Jun. 30, 2013
PST Eletronicaltda [Member]
Jun. 30, 2014
PST Eletronicaltda [Member]
Jun. 30, 2013
PST Eletronicaltda [Member]
Dec. 31, 2013
PST Eletronicaltda [Member]
Jun. 30, 2014
Minda Stoneridge Instruments Ltd [Member]
Jun. 30, 2013
Minda Stoneridge Instruments Ltd [Member]
Jun. 30, 2014
Minda Stoneridge Instruments Ltd [Member]
Jun. 30, 2013
Minda Stoneridge Instruments Ltd [Member]
Dec. 31, 2013
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]                                
Equity method investment, ownership percentage                       49.00%   49.00%   49.00%
Percentage ownership in consolidated subsidiary         74.00%       74.00%   74.00%          
Equity method investments                       $ 6,529   $ 6,529   $ 5,981
Income (loss) from equity method investments 144 96 382 297               144 96 382 297  
Noncontrolling interest 33,678   33,678   33,678 39,540 33,678 41,209 33,678 41,209            
Noncontroling interest increase (decrease)                 (5,862) (2,867)            
Foreign currency translation adjustments                 (2,337) 3,455            
Dividend from noncontrolling interest                   211            
Net income (loss) attributable to noncontrolling interests (7,221) 634 (8,199) 794         (8,199) 799            
Comprehensive income (loss) related to noncontrolling interest $ (7,221) $ 634 $ (8,199) $ 794     $ (6,230) $ (3,468) $ (5,863) $ (2,656)