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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

		December 31,
		2016			2017
		(in thousands)
Land		$	14,328			14,328
Building and improvements			22,821			24,944
Machinery			42,687			54,262
Research and development equipment			26,695			35,180
Software			12,902			10,484
Office furniture and equipment			11,210			11,694
Others			27,269			29,158
			157,912			180,050
Accumulated depreciation and amortization			(111,915)			(122,148)
Prepayment for purchases of land, building and equipment			2,175			28,771
		$	48,172			86,673

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- References

No definition available.

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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

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