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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands |  | 3 Months Ended | 65 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 16, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | May 15, 2017 | Mar. 31, 2018 BRL (R$) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  | $ 521 | $ 180 |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
Noncontrolling interest | $ 14,458 |  | 14,489 |  |  |  |  |  | $ 13,762
Dividends payable, price index adjustment |  |  |  |  | R$ 249 | $ 75 |  |  |
PST Eletronica Ltda [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cash payment at closing | 1,500 |  |  |  |  |  |  |  |
Fair value of earn-out liability | 10,180 |  |  |  |  |  |  |  |
Carrying value of investment | 31,453 |  |  |  |  |  |  |  |
Carrying value of foreign currency translation | $ (16,995) |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  | R$ 22,579 | $ 6,833 | R$ 22,330 | $ 6,742 |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 49.00% | 49.00% |  |  |
Equity method investments |  |  |  |  |  | $ 10,452 |  | $ 10,131 |
Income (loss) from equity method investments |  | $ 521 | $ 180 |  |  |  |  |  |

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