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Debt (Narrative) (Details) SEK in Thousands, $ in Thousands | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2017 SEK | Dec. 31, 2017 USD ($) | Jan. 30, 2017 USD ($) | Aug. 12, 2016 USD ($) | Sep. 12, 2014 USD ($) | Nov. 02, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  | $ 61 | $ 399 |  |
Notes covenant compliance |  |  | The Company was in compliance with all debt covenants at December 31, 2017 and 2016. |  |  |  |  |
Borrowings outstanding | $ 67,000 |  |  | $ 121,000 |  |  |  |
Outstanding letters of credit | 3,399 |  |  | 2,008 |  |  |  |
Total long-term debt, net | 8,060 |  |  | 3,852 |  |  |  |
Less: current portion | 8,626 |  |  | 4,192 |  |  |  |
2018 |  |  |  | 4,192 |  |  |  |
2019 |  |  |  | 2,700 |  |  |  |
2020 |  |  |  | 601 |  |  |  |
2021 |  |  |  | 121,551 |  |  |  |
2022 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  | $ (10,507) |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit Facility covenant compliance |  |  | The Company was in compliance with all Credit Facility covenants at December 31, 2017 and 2016. |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 300,000 | $ 100,000
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  | $ 80,000 |
Credit facility, borrowing capacity |  |  |  |  |  |  |  | $ 100,000
Borrowings outstanding | 67,000 |  |  | $ 121,000 |  |  |  |
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% |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 2,196 |  | SEK 20,000 | $ 2,439 |  |  |  |
Amendment Number 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 Eletronica Ltda [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  | 10.90% | 10.90% |  |  |  |
PST Eletronica Ltda [Member] | Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
2018 |  |  |  | $ 4,164 |  |  |  |
2019 |  |  |  | 2,700 |  |  |  |
2020 |  |  |  | 601 |  |  |  |
2021 |  |  |  | $ 551 |  |  |  |
Borrowing Sub-Limit for the Company's Foreign Subsidiaries [Member] | Amendment Number 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 Number 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 |  |  |  |  |  |  |

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