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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 BRL | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (loss) from equity method investments | $ 180 | $ 143 |  |  |
Noncontrolling interest |  |  |  | $ 14,489 | $ 13,762
Less: Net loss attributable to noncontrolling interest | $ (30) | (1,130) |  |  |
PST Eletronicaltda [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage ownership in consolidated subsidiary | 74.00% |  |  |  |
Noncontrolling interest |  | 13,370 |  | 14,489 |
Foreign currency translation adjustments | $ 757 | 1,190 |  |  |
Less: Net loss attributable to noncontrolling interest | (30) | (1,130) |  |  |
Comprehensive income (loss) related to noncontrolling interest | 727 | 60 |  |  |
Dividends payable |  |  | BRL 10,842 | $ 3,472 |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% | 49.00% |
Equity method investments |  |  |  | $ 8,514 | $ 7,952
Income (loss) from equity method investments | $ 180 | $ 143 |  |  |

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