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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 18 Months Ended |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 PST Eletronicaltda [Member] | Jun. 30, 2013 PST Eletronicaltda [Member] | Jun. 30, 2014 PST Eletronicaltda [Member] | Jun. 30, 2013 PST Eletronicaltda [Member] | Dec. 31, 2013 PST Eletronicaltda [Member] | Jun. 30, 2014 Minda Stoneridge Instruments Ltd [Member] | Jun. 30, 2013 Minda Stoneridge Instruments Ltd [Member] | Jun. 30, 2014 Minda Stoneridge Instruments Ltd [Member] | Jun. 30, 2013 Minda Stoneridge Instruments Ltd [Member] | Dec. 31, 2013 Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  | 49.00% |  | 49.00%
Percentage ownership in consolidated subsidiary |  |  |  |  | 74.00% |  |  |  | 74.00% |  | 74.00% |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 6,529 |  | $ 6,529 |  | $ 5,981
Income (loss) from equity method investments | 144 | 96 | 382 | 297 |  |  |  |  |  |  |  | 144 | 96 | 382 | 297 |
Noncontrolling interest | 33,678 |  | 33,678 |  | 33,678 | 39,540 | 33,678 | 41,209 | 33,678 | 41,209 |  |  |  |  |  |
Noncontroling interest increase (decrease) |  |  |  |  |  |  |  |  | (5,862) | (2,867) |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (2,337) | 3,455 |  |  |  |  |  |
Dividend from noncontrolling interest |  |  |  |  |  |  |  |  |  | 211 |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interests | (7,221) | 634 | (8,199) | 794 |  |  |  |  | (8,199) | 799 |  |  |  |  |  |
Comprehensive income (loss) related to noncontrolling interest | $ (7,221) | $ 634 | $ (8,199) | $ 794 |  |  | $ (6,230) | $ (3,468) | $ (5,863) | $ (2,656) |  |  |  |  |  |

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- Definition Amount after tax of (increase) decrease in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613674-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 + Details
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