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Investments (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Income (Loss) From Equity Method Investments | $ 96 | $ 97 | $ 297 | $ 236 |
Noncontrolling Interest, Ownership Percentage by Parent | 74.00% |  | 74.00% |  |
Noncontrolling interest | 41,209 |  | 41,209 |  | 44,081
Net loss attributable to noncontrolling interest | 634 | (1,740) | 794 | (1,873) |
Pst Eletronica Ltda [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 74.00% | 74.00% | 74.00% | 74.00% | 74.00%
Noncontrolling Interest, Period Increase (Decrease) |  |  | 2,867 |  |
Noncontrolling interest | 41,209 |  | 41,209 |  |
Noncontrolling Interest Increase Due To Change In Foreign Currency Translation |  |  | 3,455 |  |
Net loss attributable to noncontrolling interest |  |  | 799 |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | 211 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 3,468 | 6,453 | 2,656 | 4,978 |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |
Income (Loss) From Equity Method Investments | 96 | 97 | 297 | 236 |
Equity Method Investment, Ownership Percentage | 49.00% | 49.00% | 49.00% | 49.00% |
Equity Method Investments | $ 6,027 |  | $ 6,027 |  | $ 6,215

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