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Debt (Narrative) (Details) | 9 Months Ended |  |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |  | 9 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Nov. 02, 2007 USD ($) | Sep. 30, 2013 Maximum [Member] | Sep. 30, 2013 Minimum [Member] USD ($) | Sep. 30, 2013 Senior Notes [Member] USD ($) | Dec. 31, 2012 Senior Notes [Member] USD ($) | Oct. 04, 2010 Senior Notes [Member] | Sep. 30, 2013 Senior Notes [Member] Reeemable After October 15, 2014 [Member] | Sep. 30, 2013 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facility [Member] USD ($) | Sep. 30, 2013 Revolving Credit Facility [Member] Maximum [Member] | Sep. 30, 2013 Revolving Credit Facility [Member] Minimum [Member] | Sep. 30, 2013 Bolton Conductive Systems L L C [Member] Revolving Credit Facility [Member] USD ($) | Sep. 30, 2013 Subsidiary[Member] USD ($) | Sep. 30, 2013 Subsidiary[Member] SEK | Dec. 31, 2012 Subsidiary[Member] USD ($) | Sep. 30, 2013 Subsidiary[Member] Term Loan [Member] USD ($) | Aug. 21, 2013 Subsidiary[Member] Term Loan [Member] CNY | Dec. 31, 2012 Subsidiary[Member] Term Loan [Member] USD ($) | Sep. 30, 2013 Subsidiary[Member] Term Loan One [Member] USD ($) | Dec. 31, 2012 Subsidiary[Member] Term Loan One [Member] USD ($) | Aug. 29, 2012 Subsidiary[Member] Term Loan One [Member] CNY | Sep. 30, 2013 PST Eletrnica Ltda. [Member] Term Loan [Member] USD ($) | Sep. 30, 2013 PST Eletrnica Ltda. [Member] Term Loan [Member] BRL
Debt instrument, 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 instrument, basis spread on variable rate |  |  |  | 1.75% | 1.00% |  |  |  |  |  | 0.50% |  | 0.25% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate as a percent of reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% | 5.50%
Debt instrument, maturity date |  |  |  |  |  | Oct. 15, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 02, 2016 | Feb. 02, 2016
Credit Facility covenat compliance | The Company was in compliance with all Credit Facility covenants at September 30, 2013 and December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount, percentage |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee percentage |  |  |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 83,636,000 | $ 74,060,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 3,111,000 | 20,000,000 | 3,075,000 |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Secured long-term debt, noncurrent |  |  |  |  |  | 175,000,000 |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt early redemption premium |  |  |  |  |  |  |  |  |  | 104.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant limits | 15,000,000 |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount |  |  |  |  |  | 2,878,000 |  | 3,296,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  | 9,000,000 |  | 25,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,470,000 | 1,445,000 |  | 11,236,000 |
Total long-term debt, net | 187,452,000 | 181,311,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,032,000 |
Long-term Debt, Weighted Average Interest Rate |  |  |  |  |  | 9.50% | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturities, repayments of principal in year two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,717,000 |
Long-term debt, maturities, repayments of principal in year three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,854,000 |
Long-term debt, maturities, repayments of principal in year four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,131,000 |
Long-term debt, maturities, repayments of principal in year five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,110,000 |
Long-term debt, maturities, repayments of principal after year five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,110,000 |
[1] | Weighted average interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.

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- Definition The percentage of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References No definition available. + Details
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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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition 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. + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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, 22 -Article 5 + 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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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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