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Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	[1]
Goodwill [Abstract]
Number of segments | Segment	7
Goodwill	$ 114,954	$ 114,954
Mainland China [Member]
Goodwill [Abstract]
Goodwill	32,179	32,179
South Korea [Member]
Goodwill [Abstract]
Goodwill	29,261	29,261
Americas [Member]
Goodwill [Abstract]
Goodwill	9,449	9,449
South Asia/Pacific [Member]
Goodwill [Abstract]
Goodwill	18,537	18,537
Japan [Member]
Goodwill [Abstract]
Goodwill	16,019	16,019
Hong Kong/Taiwan [Member]
Goodwill [Abstract]
Goodwill	6,634	6,634
EMEA [Member]
Goodwill [Abstract]
Goodwill	$ 2,875	$ 2,875
[1] Goodwill was recast to reflect current period presentation by geographic region at December 31, 2016.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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