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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2015 |  | 2016 |
|  | (in thousands) |
Land |  | $ | 14,328 |  |  | 14,328 |
Building and improvements |  |  | 22,460 |  |  | 22,821 |
Machinery |  |  | 42,770 |  |  | 42,687 |
Research and development equipment |  |  | 25,949 |  |  | 26,695 |
Software |  |  | 13,260 |  |  | 12,902 |
Office furniture and equipment |  |  | 10,655 |  |  | 11,210 |
Others |  |  | 24,793 |  |  | 27,269 |
|  |  | 154,215 |  |  | 157,912 |
Accumulated depreciation and amortization |  |  | (101,373) |  |  | (111,915) |
Prepayment for purchases of land and equipment |  |  | 1,619 |  |  | 2,175 |
|  | $ | 54,461 |  |  | 48,172 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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