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Debt (Narrative) (Details) SEK in Thousands				3 Months Ended		5 Months Ended	6 Months Ended	12 Months Ended		14 Months Ended
	Jan. 30, 2017	Oct. 15, 2014 USD ($)	Sep. 02, 2014 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 CNY (¥)	Aug. 12, 2016 USD ($)	Dec. 31, 2015 SEK	Dec. 31, 2015 USD ($)	Oct. 18, 2014	Sep. 12, 2014 USD ($)	Oct. 04, 2010 USD ($)	Nov. 02, 2007 USD ($)
Debt Instrument [Line Items]
Capitalized deferred financing costs											$ 399,000
Notes covenant compliance								The Company was in compliance with all debt covenants at December 31, 2016 and 2015.
Borrowings outstanding		$ 100,000,000				$ 67,000,000		$ 67,000,000					$ 100,000,000
Total long-term debt, net						8,060,000		8,060,000					4,458,000
Less: current portion						8,626,000		8,626,000					13,905,000
Loss on early extinguishment of debt									$ (10,607,000)
2017						8,626,000		8,626,000
2018						4,303,000		4,303,000
2019						2,604,000		2,604,000
2020						611,000		611,000
2021						67,542,000		$ 67,542,000
Senior Notes [Member]
Debt Instrument [Line Items]
Write off of deferred financing costs				$ 535,000	$ 295,000
Debt interest rate																9.50%
Debt instrument, maturity date								Oct. 15, 2017
Debt instrument, unamortized discount, percentage														2.50%
Face value of senior secured notes						$ 175,000,000		$ 175,000,000
Percentage of outstanding debt redeemed			10.00%
Debt early redemption percentage		104.75%	103.00%
Amortization of debt discount (premium)				2,019,000
De-designation date unrecognized gain on interest rate swap				348,000
Redemption of notes		$ 157,500,000	$ 17,500,000
Debt, face amount																$ 175,000,000
Loss on early extinguishment of debt				(9,687,000)	(820,000)		$ (10,507,000)
Premium paid on extinguishment of debt				7,481,000	$ 525,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Write off of deferred financing costs									100,000
Capitalized deferred financing costs				$ 1,666,000			$ 1,666,000		$ 1,666,000
Credit Facility covenant compliance								The Company was in compliance with all Credit Facility covenants at December 31, 2016 and 2015.
Debt interest rate						2.00%		2.00%
Line of credit facility, maximum borrowing capacity															$ 300,000,000		$ 100,000,000
Increase in maximum borrowing capacity of credit facility															$ 80,000,000
Credit facility, borrowing capacity																	$ 100,000,000
Borrowings outstanding						$ 67,000,000		$ 67,000,000					100,000,000
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						$ 2,196,000		$ 2,196,000				SEK 20,000	$ 2,369,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Outstanding letters of credit						$ 3,399,000		$ 3,399,000
Term Loan Two [Member]
Debt Instrument [Line Items]
Debt, face amount | ¥										¥ 9,000,000
Term Loan Two [Member] | People's Bank of China One-Year Lending Rate [Member]
Debt Instrument [Line Items]
Interest rate multiplier										120.00%
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						14.10%		14.10%
Short-term debt, weighted average interest rate						10.30%		10.30%
PST Eletronica Ltda [Member] | Term Loan [Member]
Debt Instrument [Line Items]
2017						$ 8,489,000		$ 8,489,000
2018						4,303,000		4,303,000
2019						2,604,000		2,604,000
2020						611,000		611,000
2021						542,000		542,000
Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility,amendment date	Jan. 30, 2017
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						80,000,000		80,000,000
Increase in sub-limit for foreign subsidiary borrowings						30,000,000		30,000,000
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						5,000,000
Amount of permitted loans and investments in foregin subsidiaries						$ 30,000,000		$ 30,000,000

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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