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Debt (Narrative) (Details) SEK in Thousands, $ in Thousands | 3 Months Ended | 8 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 SEK | Mar. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jan. 30, 2017 USD ($) | Dec. 31, 2016 SEK | Dec. 31, 2016 USD ($) | Aug. 12, 2016 USD ($) | Sep. 12, 2014 USD ($) | Oct. 04, 2010 | Nov. 02, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 141,000 |  |  | $ 67,000 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 9.50% |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  | $ 47 |  |  | $ 339 |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 300,000 |  | $ 100,000
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  |  | $ 80,000 |  |
Borrowings outstanding |  |  | $ 141,000 |  |  | 67,000 |  |  |  |
Line of credit expiration date | Sep. 12, 2019 |  |  |  |  |  |  |  |  |
Maximum leverage ratio | 300.00% |  | 300.00% |  |  |  |  |  |  |
Minimum interest coverage ratio | 350.00% |  | 350.00% |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage | 0.35% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage | 0.20% |  |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 3,367 |  |  | 3,399 |  |  |  |
Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit Facility covenant compliance | The Company was in compliance with all Credit Facility covenants at March 31, 2017 and December 31, 2016 |  |  |  |  |  |  |  |  |
Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facilty amendement date |  | Aug. 12, 2016 |  |  |  |  |  |  |  |
Length of the amended extension to the expiration date on debt |  | 2 years |  |  |  |  |  |  |  |
Line of credit expiration date |  | Sep. 12, 2021 |  |  |  |  |  |  |  |
PST Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes covenant compliance | PST was in compliance with all debt covenants at March 31, 2017 and December 31, 2016. |  |  |  |  |  |  |  |  |
PST Eletronicaltda [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate | 13.20% |  | 13.20% |  |  |  |  |  |  |
Short-term debt, weighted average interest rate | 5.10% |  | 5.10% |  |  |  |  |  |  |
PST Eletronicaltda [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
April 2017 through March 2018 |  |  | $ 6,806 |  |  |  |  |  |  |
April 2018 to December 2018 |  |  | 3,378 |  |  |  |  |  |  |
2019 |  |  | 2,718 |  |  |  |  |  |  |
2020 |  |  | 637 |  |  |  |  |  |  |
2021 |  |  | 584 |  |  |  |  |  |  |
Borrowing Sub-Limit for the Company's Foreign Subsidiaries [Member] | Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, capacity restrictions of investment activities |  |  | 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 foregin subsidiaries. |  | $ 5,000 |  |  |  |  |  |  |  |
Amount of permitted loans and investments in foregin subsidiaries |  |  | 30,000 |  |  |  |  |  |  |
Electronics [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | SEK 20,000 |  | 2,230 |  | SEK 20,000 | 2,196 |  |  |  |
Borrowings outstanding |  |  | $ 0 |  |  | $ 0 |  |  |  |

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