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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt (Narrative) (Details) kr in Thousands, $ in Thousands	1 Months Ended	6 Months Ended
Debt (Narrative) (Details) kr in Thousands, $ in Thousands	Aug. 31, 2016 USD ($)	Jun. 30, 2018 SEK (kr)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 SEK (kr)	Dec. 31, 2017 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			$ 110,000		$ 121,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt interest rate									9.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Capitalized deferred financing costs								$ 339
Line of credit facility, maximum borrowing capacity										$ 300,000	$ 100,000
Increase in maximum borrowing capacity of credit facility										$ 80,000
Borrowings outstanding			$ 110,000		121,000
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%
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			$ 2,008		2,008
Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility covenant compliance		The Company was in compliance with all Credit Facility covenants at June 30, 2018 and December 31, 2017
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
Amendment Four [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Capitalized deferred financing costs						$ 61
PST Debt [Member]
Debt Instrument [Line Items]
Notes covenant compliance		PST was in compliance with all debt covenants at June 30, 2018 and December 31, 2017.
PST Eletronica Ltda [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
July 2018 through June 2019			3,181
July 2019 through December 2019			806
2020			513
2021			$ 471
PST Eletronica Ltda [Member] \| PST Long-Term Notes [Member]
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate		10.03%	10.03%
PST Eletronica Ltda [Member] \| PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt, weighted average interest rate		11.30%	11.30%
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 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		kr 20,000	$ 2,236	kr 20,000	2,439
Borrowings outstanding			$ 0		$ 0