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Debt (Narrative) (Details) | 6 Months Ended | 12 Months Ended | 18 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended |
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Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2014 People's Bank of China One-Year Lending Rate [Member] | Jun. 30, 2014 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member] | Jun. 30, 2014 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member] | Jun. 30, 2014 Senior Notes [Member] USD ($) | Dec. 31, 2013 Senior Notes [Member] USD ($) | Oct. 04, 2010 Senior Notes [Member] | Jun. 30, 2014 Senior Notes [Member] Annual Payment [Member] | Jun. 30, 2014 Senior Notes [Member] Maximum [Member] Annual Payment [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] USD ($) | Jun. 30, 2014 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility [Member] USD ($) | Nov. 02, 2007 Revolving Credit Facility [Member] USD ($) | Jun. 30, 2014 Revolving Credit Facility [Member] Federal Funds Rate [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] Maximum [Member] Federal Funds Rate [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] Minimum [Member] USD ($) | Jun. 30, 2014 Revolving Credit Facility [Member] Minimum [Member] Federal Funds Rate [Member] | Jun. 30, 2014 Line of Credit [Member] USD ($) | Jun. 30, 2014 Line of Credit [Member] SEK | Dec. 31, 2013 Line of Credit [Member] USD ($) | Jun. 30, 2014 Term Loan [Member] USD ($) | Feb. 25, 2014 Term Loan [Member] CNY | Dec. 31, 2013 Term Loan [Member] USD ($) | Jun. 30, 2014 Term Loan One [Member] USD ($) | Dec. 31, 2013 Term Loan One [Member] USD ($) | Aug. 21, 2013 Term Loan One [Member] CNY | Jun. 30, 2014 Term Loan One [Member] People's Bank of China One-Year Lending Rate [Member] | Jun. 30, 2014 PST Eletronicaltda [Member] | Jun. 30, 2014 PST Eletronicaltda [Member] Term Loan [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility covenat compliance | The Company was in compliance with all Credit Facility covenants at June 30, 2014 and December 31, 2013 | The Company was in compliance with all Credit Facility covenants at June 30, 2014 and December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes covenant compliance |  |  | The Company was in compliance with all note covenants at June 30, 2014 and December 31, 2013. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest is payable quarterly at either (i) the higher of the prime rate or the Federal Funds rate plus 0.50%, plus a margin of 0.00% to 0.25% or (ii) LIBOR plus a margin of 1.00% to 1.75%, depending upon the Company's undrawn availability, as defined. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 7.39% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Oct. 15, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount, percentage |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  | $ 2,992,000 | 20,000,000 | $ 3,107,000 |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 85,446,000 | 85,446,000 | 71,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% | 1.00% |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.25% |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate multiplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132.00% |  |
Line of credit, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Face value of senior secured notes |  |  |  |  |  |  | 175,000,000 |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, capacity restrictions of investment activities |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note redeemable start date |  |  |  |  |  |  | Oct. 15, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding debt redeemed |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt early redemption premium |  |  |  |  |  |  | 104.75% |  |  |  | 103.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | 2,428,000 |  | 2,732,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  | 9,000,000 |  |  |
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,451,000 | 1,487,000 |  |  |  |
Credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, net | 182,889,000 | 185,045,000 | 182,889,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: current portion | 22,213,000 | 12,187,000 | 22,213,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,539,000
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,595,000
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,359,000
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,168,000
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,124,000
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,124,000
Long-term debt, weighted average interest rate |  |  |  |  |  |  | 9.50% | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90% |
Short-term debt, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.90% |
[1] | Interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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