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Investments (Narrative) (Details) BRL in Thousands |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended | 60 Months Ended | 64 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2017 USD ($) | May 15, 2017 | Dec. 31, 2011 | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Apr. 30, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | May 15, 2017 | Jun. 30, 2017 BRL | Jun. 30, 2017 USD ($) | May 16, 2017 BRL | May 16, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment at closing |  |  |  |  |  |  | $ 1,796,000 |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  | $ 13,762,000 |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  | $ 555,000 | $ 153,000 |  | 735,000 | $ 296,000 |  |  |  |  |  |  |  |  |
PST Eletronicaltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  | 74.00% | 74.00% |  |  | 74.00% |  |  | 74.00% | 74.00% |  |  |  |  |  |  |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% | 26.00% |  |  |
Noncontrolling interest |  |  |  |  | 14,171,000 |  |  | 14,171,000 | $ 13,762,000 |  |  |  |  | $ 14,458,000 | $ 14,489,000 | $ 13,370,000 | $ 13,310,000
Dividends payable |  |  |  |  |  |  |  |  |  |  | BRL 20,451 | $ 6,185,000 | BRL 9,610 | 3,092,000 |  |  |
PST Eletronicaltda [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment at closing | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,453,000 |  |  |
Carrying value of foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (16,995,000) |  |  |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 7,952,000 |  |  | $ 9,108,000 |  |  |  |  |
Income (loss) from equity method investments |  |  |  | $ 555,000 | $ 153,000 |  | $ 735,000 | $ 296,000 |  |  |  |  |  |  |  |  |

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