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Debt (Narrative) (Details) SEK in Thousands, $ in Thousands | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 SEK | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 12, 2014 USD ($) | Oct. 04, 2010 | Nov. 02, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings outstanding |  | $ 100,000 | $ 100,000 |  |  |
Maximum leverage ratio | 300.00% | 300.00% |  |  |  |
Minimum interest coverage ratio | 350.00% | 350.00% |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  |  | 9.50% |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 1.69% | 1.69% |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 300,000 |  | $ 100,000
Increase in maximum borrowing capacity of credit facility |  |  |  | $ 80,000 |  |
Borrowings outstanding |  | $ 100,000 | 100,000 |  |  |
Line of credit expiration date | Sep. 12, 2019 |  |  |  |  |
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% |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, current |  | $ 0 | 0 |  |  |
Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit Facility covenant compliance | The Company was in compliance with all credit facility covenants at March 31, 2016 and December 31, 2015 |  |  |  |  |
PST Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes covenant compliance | The Company was in compliance with all debt covenants at March 31, 2016 and December 31, 2015. |  |  |  |  |
PST Eletronicaltda [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, weighted average interest rate | 7.30% | 7.30% |  |  |  |
Short-term debt, weighted average interest rate | 16.00% | 16.00% |  |  |  |
PST Eletronicaltda [Member] | Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
April 2016 through March 2017 |  | $ 16,503 |  |  |  |
April 2017 to December 2017 |  | 1,400 |  |  |  |
2018 |  | 1,082 |  |  |  |
2019 |  | 1,058 |  |  |  |
2020 |  | 363 |  |  |  |
2021 |  | 303 |  |  |  |
Electronics [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | SEK 20,000 | $ 2,464 | $ 2,369 |  |  |

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