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Investments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (loss) from equity method investments | $ 143 | $ 144 | $ 332 | $ 382 |
Noncontrolling interest | 18,353 |  | 18,353 |  | $ 22,550
Less: loss attributable to noncontrolling interest | $ (596) | (7,221) | (1,005) | (8,199) |
PST Eletronicaltda [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage ownership in consolidated subsidiary | 74.00% |  |  |  |
Noncontrolling interest | $ 18,353 | 33,678 | 18,353 | 33,678 |
Foreign currency translation adjustments |  |  | (3,192) | 2,337 |
Less: loss attributable to noncontrolling interest |  |  | 1,005 | 8,199 |
Comprehensive income (loss) related to noncontrolling interest | $ 32 | (6,230) | $ (4,197) | (5,862) |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  | 49.00% |  |
Equity method investments | $ 6,916 |  | $ 6,916 |  | $ 6,653
Income (loss) from equity method investments | $ 143 | $ 144 | $ 332 | $ 382 |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), 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=35736750&loc=SL4591552-111686 + Details
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