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Debt (Narrative) (Details) kr in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2016 | Aug. 31, 2016 USD ($) | Mar. 31, 2019 SEK (kr) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 SEK (kr) | Dec. 31, 2018 USD ($) | Oct. 26, 2018 USD ($) | Sep. 11, 2018 USD ($) | Jan. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 12, 2016 USD ($) | Mar. 25, 2015 | Sep. 12, 2014 USD ($) | Nov. 02, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 91,000 |  | $ 96,000 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  |  |  |  |  |  |  | $ 399 |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 100,000
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000 |
Borrowings outstanding |  |  |  | $ 91,000 |  | 96,000 |  |  |  |  |  |  |  |
Line of credit expiration date | Sep. 12, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  | 3.50% | 3.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  | 0.35% |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 3.55% | 3.55% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 3.54% | 3.54% |  |  |  |  |  |  |  |  |  |
Asset-Based Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000
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 March 31, 2019 and December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Amendment Date |  |  | Aug. 12, 2016 |  |  |  |  |  |  |  |  |  |  |
Line of credit expiration date |  |  | Sep. 12, 2021 |  |  |  |  |  |  |  |  |  |  |
Amendment Four [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  |  |  |  |  | $ 61 |  |  |  |  |
Amendment Five [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, capacity restrictions of investment activities |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |
Amendment Six [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum value of common shares allowed to be repurchased |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |
PST Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes covenant compliance |  |  | The Company was in compliance with all debt covenants at March 31, 2019 and December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  | 1,013 |  |  |  |  |  |  |  |  |  |
2020 |  |  |  | 380 |  |  |  |  |  |  |  |  |  |
2021 |  |  |  | $ 466 |  |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] | PST Long-Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] | PST Short-Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, weighted average interest rate |  |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |
Borrowing Sub-Limit for the Company's Foreign Subsidiaries [Member] | Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sub-limit for foreign subsidiary borrowings |  |  |  |  |  |  |  |  |  | $ 80,000 |  |  |  |
Increase in sub-limit for foreign subsidiary borrowings |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Permitted Loans and Investments in Foreign Subsidiaries [Member] | Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Permitted Loans and Investments in Foreign Subsidiaries |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of Permitted Loans and Investments in Foreign Subsidiaries |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |
Electronics [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | kr 20,000 | $ 2,152 | kr 20,000 | 2,259 |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |

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