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Debt (Narrative) (Details) kr in Thousands, $ in Thousands		1 Months Ended	9 Months Ended
Debt (Narrative) (Details) kr in Thousands, $ in Thousands	Aug. 11, 2016	Aug. 31, 2016 USD ($)	Sep. 30, 2018 SEK (kr)	Oct. 26, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 11, 2018 USD ($)	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					$ 101,000			$ 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					$ 101,000			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 September 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
Amendment Five [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, capacity restrictions of investment activities						$ 10,000
PST Debt [Member]
Debt Instrument [Line Items]
Notes covenant compliance			PST was in compliance with all debt covenants at September 30, 2018 and December 31, 2017.
PST Eletronica Ltda [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
October 2018 through September 2019					1,808
October 2019 through December 2019					330
2020					465
2021					$ 423
PST Eletronica Ltda [Member] \| PST Long-Term Notes [Member]
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate			8.65%		8.65%
PST Eletronica Ltda [Member] \| PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt, weighted average interest rate			11.26%		11.26%
Subsequent Event [Member] \| Amendment Six [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum value of common shares allowed to be repurchased				$ 50,000
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		$ 2,250		kr 20,000	2,439
Borrowings outstanding					$ 0			$ 0