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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 State and Local Jurisdiction [Member] | Dec. 31, 2013 Foreign Tax Authority [Member] | Dec. 31, 2013 U.S. Federal [Member] | Dec. 31, 2011 PST Eletronicaltda [Member] | Dec. 31, 2011 PST Eletronicaltda [Member] | Dec. 30, 2011 PST Eletronicaltda [Member] | Dec. 31, 2010 PST Eletronicaltda [Member]
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes | $ 1,066 | $ 1,016 | $ 1,125 | $ 1,019 | $ 95 | $ 383 | $ (884) | $ 1,218 | $ 4,226 | $ 812 | $ 26,105 |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  |  |  |  | 20.40% | 17.80% | 36.40% |  |  |  |  |  |  |
Unremitted earnings of foreign subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,509 |  |  |  |
Net operating loss carry forwards |  |  |  |  |  |  |  |  |  |  |  | 96,260 | 22,381 | 106,637 |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  | Dec. 31, 2025 |  |  |  |  |  |  |  |  |
General business and foreign tax credit carry forwards |  |  |  |  |  |  |  |  |  |  |  | 2,005 | 1,908 | 12,271 |  |  |  |
General business and foreign tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00%
Reduction of noncurrent deferred tax asset |  |  |  |  |  |  |  |  | 3,329 |  |  |  |  |  |  |  |  |
Liability for uncertain tax positions, noncurrent | 639 |  |  |  |  |  |  |  | 639 |  |  |  |  |  |  |  |  |
Amount affecting the Company's tax rate |  |  |  |  |  |  |  |  | 3,547 |  |  |  |  |  |  |  |  |
Gross interest and penalties |  |  |  |  |  |  |  |  | (82) | 64 | 67 |  |  |  |  |  |  |
Accrued payment of interest and penalties | 624 |  |  |  | 706 |  |  |  | 624 | 706 |  |  |  |  |  |  |  |
Deferred tax liability related to earnings that are not considered indefinitely reinvested |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 456 |  |  |  |
Increase in equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% | 24.00% |  |

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- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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