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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands | 3 Months Ended | 64 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | May 15, 2017 | Mar. 31, 2019 BRL (R$) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 BRL (R$) | Mar. 31, 2018 USD ($) | May 16, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments | $ 364 | $ 521 |  |  |  |  |  |  |  |
Fair value and other adjustments | 16 |  |  |  |  |  |  |  |  |
MSIL |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 49.00% | 49.00% |  |  | 49.00% | 49.00% |
Equity method investments |  |  |  |  | $ 11,738 |  | $ 11,288 |  |  |
Income (loss) from equity method investments | $ 364 | $ 521 |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  |  | 74.00% |  |  |  |  |  |  |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  |  |  |  |  | 26.00%
Dividends Payable, Price Index Adjustment |  |  |  | R$ 261 | 68 |  |  | R$ 249 | $ 75 |
PST Eletronica Ltda [Member] | Noncontrolling interest |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  | R$ 23,465 | 5,980 | R$ 23,204 | 5,980 |  |  |
Autotech Ventures [Member] | Venture Capital Funds [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment commitment |  |  |  |  |  |  | 10,000 |  |  |
Investment |  |  |  |  | 853 |  | $ 437 |  |  |
Contribution by company |  |  |  |  | $ 400 |  |  |  |  |

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