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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.

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- 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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