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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

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Debt (Narrative) (Details) SEK in Thousands, $ in Thousands	5 Months Ended	6 Months Ended	12 Months Ended
Debt (Narrative) (Details) SEK in Thousands, $ in Thousands	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