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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 16, 2017 USD ($) | May 15, 2017 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2017 BRL | Dec. 31, 2017 USD ($) | May 16, 2017 BRL | May 16, 2017 USD ($) | Dec. 31, 2016 BRL | Dec. 31, 2016 USD ($) | Dec. 31, 2010
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  | $ 1,636 | $ 1,233 | $ 608 |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,762 |
Payments to Noncontrolling Interests |  |  | 1,848 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the earn-out consideration |  |  | 20,746 |  |  |  |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Percentage ownership in consolidated subsidiary |  | 74.00% |  | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% |  |  |  |  |  |  |
Additional Percentage Of Noncontrolling Interest Acquired | 26.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  | $ 13,310 | $ 22,550 |  |  |  |  |  | $ 14,458 |  | 13,762 |
Noncontrolling interest, (decrease) from distributions to noncontrolling interest holders |  |  | 14,458 |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable to noncontrolling interest |  |  |  |  |  |  |  |  | BRL 22,330 | $ 6,742 | BRL 9,610 | 3,092 |  |  |
Payments to Noncontrolling Interests | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the earn-out consideration | $ 10,180 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable Price Index Adjustment |  |  |  |  |  |  |  |  | BRL 1,879 | $ 567 |  |  | BRL 10,842 | $ 3,327 |
PST Eletronica Ltda [Member] | Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | 16,995 |  |  |
PST Eletronica Ltda [Member] | Additional Paid-In Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | $ 31,453 |  |  |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 49.00% |  |  |  | 49.00% | 49.00% |  |  | 49.00% | 49.00% |
Equity method investments |  |  |  |  |  |  |  |  |  | $ 10,131 |  |  |  | $ 7,952 |
Income (loss) from equity method investments |  |  | $ 1,636 | $ 1,233 | $ 608 |  |  |  |  |  |  |  |  |  |

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