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Debt (Narrative) (Details) ¥ in Thousands, kr in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 SEK (kr) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 CNY (¥) | Jun. 30, 2019 USD ($) | Jun. 05, 2019 USD ($) | Dec. 31, 2018 SEK (kr) | Dec. 31, 2018 USD ($) | Sep. 12, 2014 USD ($) | Nov. 02, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 108,500 |  |  |  |  | $ 96,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  |  | $ 1,342 |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 400,000 |  |  | $ 300,000 |
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  | $ 150 |  |  |  |
Borrowings outstanding |  |  |  | 108,500 |  |  |  |  | 96,000 |  |
Write off of deferred debt issuance cost | $ 275 |  |  |  |  |  |  |  |  |  |
Debt instrument covenant default of other debt maximum amount |  |  |  | $ 30,000 |  |  |  |  |  |  |
Debt instrument covenant uninsured asset losses maximum amount |  | $ 30,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 3.12% | 3.12% | 3.12% |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 3.07% | 3.07% | 3.07% |  |  |  |  |  |
Asset-Based Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 100,000
Suzhou Short-Term Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 8,394 | ¥ 60,000 |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 2,099 |  |  |  |  | 0 |  |
Outstanding credit lines weighted-average interest rate |  |  | 4.80% | 4.80% | 4.80% |  |  |  |  |  |
Suzhou Short-Term Credit Line [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding credit lines interest rate |  | 5.00% |  |  |  |  |  |  |  |  |
Suzhou Short-Term Credit Line [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding credit lines interest rate |  | 4.70% |  |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | $ 1,815 |  |  |  |  | 1,815 |  |
Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit Facility covenant compliance |  | The Company was in compliance with all credit facility covenants at September 30, 2019 and December 31, 2018 |  |  |  |  |  |  |  |  |
PST Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes covenant compliance |  | The Company was in compliance with all debt covenants at September 30, 2019 and December 31, 2018 |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  | 653 |  |  |  |  |  |  |
2020 |  |  |  | 120 |  |  |  |  |  |  |
2021 |  |  |  | $ 439 |  |  |  |  |  |  |
PST Eletronica Ltda [Member] | PST Long-Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 7.00% | 7.00% | 7.00% |  |  |  |  |  |
PST Eletronica Ltda [Member] | PST Short-Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt, weighted average interest rate |  |  | 6.00% | 6.00% | 6.00% |  |  |  |  |  |
Electronics [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | kr 20,000 | $ 2,032 |  |  |  | kr 20,000 | 2,259 |  |
Borrowings outstanding |  |  |  | 0 |  |  |  |  | 0 |  |
PST Short-Term Obligations [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 149 |  |  |  |  | $ 989 |  |

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