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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Income (loss) from equity method investments | $ 99 | $ 207 | $ 396 | $ 443 |
Equity method investment, ownership percentage | 74.00% |  | 74.00% |  |
Noncontrolling interest | 41,423 |  | 41,423 |  | 44,081
Net income attributable to noncontrolling interest | 466 | 170 | 1,260 | (1,703) |
Comprehensive (income) loss attributable to noncontrolling interest | 466 | 170 | 1,260 | (1,703) |
PST Eletrnica Ltda. [Member] |  |  |  |  |
Equity method investment, ownership percentage | 74.00% | 74.00% | 74.00% | 74.00% |
Noncontrolling interest, period increase (decrease) |  |  | 2,653 |  |
Noncontrolling interest | 41,243 |  | 41,243 |  |
Net income attributable to noncontrolling interest |  |  | 1,264 |  |
Noncontrolling interest, decrease from distributions to noncontrolling interest holders |  |  | 211 |  |
Foreign currency translation adjustment to noncontrolling interest |  |  | 3,706 |  |
Comprehensive (income) loss attributable to noncontrolling interest | (214) | (85) | 2,442 | 4,893 |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |
Income (loss) from equity method investments | 99 | 207 | 396 | 443 |
Equity method investments | $ 5,817 |  | $ 5,817 |  | $ 6,215
Equity method investment, ownership percentage | 49.00% |  | 49.00% |  |

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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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