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Investments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (loss) from equity method investments | $ 160 | $ 205 | $ 492 | $ 587 |
Noncontrolling interest | 14,273 |  | 14,273 |  | $ 22,550
Less: income (loss) attributable to noncontrolling interest | $ (69) | 1,160 | (1,074) | (7,039) |
PST Eletronicaltda [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage ownership in consolidated subsidiary | 74.00% |  |  |  |
Noncontrolling interest | $ 14,273 | 31,383 | 14,273 | 31,383 |
Foreign currency translation adjustments |  |  | (7,203) | (1,118) |
Less: income (loss) attributable to noncontrolling interest |  |  | (1,074) | (7,039) |
Comprehensive income (loss) related to noncontrolling interest | $ (4,080) | (2,294) | $ (8,277) | (8,157) |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  | 49.00% |  |
Equity method investments | $ 6,872 |  | $ 6,872 |  | $ 6,653
Income (loss) from equity method investments | $ 160 | $ 205 | $ 492 | $ 587 |

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