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Commitments and Contingencies (Narrative) (Details) R$ in Thousands | 3 Months Ended | 9 Months Ended | 64 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | May 15, 2017 | Sep. 30, 2019 BRL (R$) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability |  |  |  |  |  |  | $ 106,000 |  | $ 111,000 |
Loss recoveries and insurance gain contingencies |  |  |  |  |  |  |  |  |  | $ 1,644,000
Product warranty and recall accrual |  |  |  |  |  |  | 3,071,000 |  | 3,283,000 |
Gain on Business Interruption Insurance Recovery | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Cash proceeds related to damaged inventory and incremental costs |  |  | 0 | 241,000 |  |  |  |  |  |
Cash proceeds within cash flows from investing activities |  |  |  | 1,403,000 |  |  |  |  |  |
Insurance recoveries | $ 0 | $ 0 | 0 | $ 0 |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on litigation |  |  | 6,473,000 |  |  |  |  |  |  |
Interest Income [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on litigation |  |  | 2,392,000 |  |  |  |  |  |  |
Professional Fees [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on litigation |  |  | $ 990,000 |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  | 1,489,000 |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  |  |  |  | 74.00% |  |  |  |  |
PST Eletronica Ltda [Member] | Civil, labor and other tax contingencies [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  | R$ 31,200 | $ 7,500,000 | R$ 29,700 | $ 7,600,000 |

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