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Debt (Narrative) (Details) |  |  |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended | 1 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Oct. 15, 2014 Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] USD ($) | Dec. 31, 2012 Senior Notes [Member] USD ($) | Oct. 04, 2010 Senior Notes [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facility [Member] USD ($) | Nov. 02, 2007 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility [Member] Minimum [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility [Member] Federal Funds Rate [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Federal Funds Rate [Member] Maximum [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Federal Funds Rate [Member] Minimum [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] L I B O R Rate [Member] Maximum [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] L I B O R Rate [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] USD ($) | Dec. 31, 2013 Line of Credit [Member] SEK | Dec. 31, 2012 Line of Credit [Member] USD ($) | Aug. 29, 2012 Term Loan One [Member] CNY | Dec. 31, 2013 Term Loan Two [Member] USD ($) | Aug. 29, 2013 Term Loan Two [Member] CNY | Dec. 31, 2012 Term Loan Two [Member] USD ($) | Dec. 31, 2013 Term Loan Two [Member] People's Bank of China One-Year Lending Rate [Member] | Feb. 28, 2013 Bolton Conductive Systems L L C [Member] Revolving Credit Facility [Member] | Oct. 13, 2009 Bolton Conductive Systems L L C [Member] Revolving Credit Facility [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] Term Loan [Member] USD ($) | Mar. 19, 2013 PST Eletronicaltda [Member] Term Loan [Member] BRL
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |
Debt instrument, maturity date |  |  |  |  |  |  | Dec. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 01, 2013 |  |  | Feb. 15, 2016 |
Debt instrument, unamortized discount, percentage |  |  |  | 2.50% |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  | $ 3,107,000 | 20,000,000 | $ 3,075,000 |  |  |  |  |  |  | $ 3,000,000 |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  | 71,072,000 | 74,060,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.25% | 0.00% | 1.75% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, percent of variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |
Face value of senior secured notes |  |  |  | 175,000,000 | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt early redemption premium |  |  | 104.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant limits |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, capacity restrictions of investment activities |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  | 2,732,000 | 3,296,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  | 9,000,000 |  |  |  |  |  |  | 25,000,000
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,487,000 |  | 1,445,000 |  |  |  |  | 10,697,000 |
Credit facilities |  |  |  |  |  |  |  | 1,160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, net | 185,045,000 | 181,311,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,909,000 |
Less: current portion | 12,187,000 | 18,925,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 12,187,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 6,691,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,616,000 |  |
2016 | 177,122,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,122,000 |
2017 | 1,057,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,057,000 |  |
2018 | 1,057,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | $ 1,057,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,057,000 |

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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 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 Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 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 long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -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 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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