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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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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) kr in Thousands, $ in Thousands		1 Months Ended	3 Months Ended
Debt (Narrative) (Details) kr in Thousands, $ in Thousands	Aug. 11, 2016	Aug. 31, 2016 USD ($)	Mar. 31, 2019 SEK (kr)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 SEK (kr)	Dec. 31, 2018 USD ($)	Oct. 26, 2018 USD ($)	Sep. 11, 2018 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				$ 91,000		$ 96,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt interest rate												9.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Capitalized deferred financing costs											$ 399
Line of credit facility, maximum borrowing capacity													$ 300,000	$ 100,000
Increase in maximum borrowing capacity of credit facility													$ 80,000
Borrowings outstanding				$ 91,000		96,000
Line of credit expiration date	Sep. 12, 2019
Maximum leverage ratio			3.00%	3.00%
Minimum interest coverage ratio			3.50%	3.50%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, commitment fee percentage			0.35%
Long-term debt, weighted average interest rate			3.55%	3.55%
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, commitment fee percentage			0.20%
Long-term debt, weighted average interest rate			3.54%	3.54%
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				$ 1,815		1,815
Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility covenant compliance			The Company was in compliance with all Credit Facility covenants at March 31, 2019 and December 31, 2018
Amendment Three [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility Amendment Date			Aug. 12, 2016
Line of credit expiration date			Sep. 12, 2021
Amendment Four [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Capitalized deferred financing costs									$ 61
Amendment Five [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, capacity restrictions of investment activities								$ 10,000
Amendment Six [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum value of common shares allowed to be repurchased							$ 50,000
PST Debt [Member]
Debt Instrument [Line Items]
Notes covenant compliance			The Company was in compliance with all debt covenants at March 31, 2019 and December 31, 2018
PST Eletronica Ltda [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
2019				1,013
2020				380
2021				$ 466
PST Eletronica Ltda [Member] \| PST Long-Term Notes [Member]
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate			8.00%	8.00%
PST Eletronica Ltda [Member] \| PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt, weighted average interest rate			6.00%	6.00%
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 Foreign Subsidiaries		$ 5,000
Amount of Permitted Loans and Investments in Foreign Subsidiaries										$ 30,000
Electronics [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			kr 20,000	$ 2,152	kr 20,000	2,259
Borrowings outstanding				$ 0		$ 0