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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Contribution [Abstract]
Operating income	$ 58,990	$ 46,262
Other income (expense)	1,207	(4,567)
Income before provision for income taxes	60,197	41,695
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income	122,430	103,315
Operating Segment [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Operating income	44,817	35,427
Operating Segment [Member] | Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income	9,172	11,059
Operating Segment [Member] | South Korea [Member]
Segment Contribution [Abstract]
Operating income	26,201	24,512
Operating Segment [Member] | Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income	16,402	13,017
Operating Segment [Member] | Japan [Member]
Segment Contribution [Abstract]
Operating income	13,238	12,426
Operating Segment [Member] | EMEA [Member]
Segment Contribution [Abstract]
Operating income	4,754	1,791
Operating Segment [Member] | Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income	7,846	5,083
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income	$ (63,440)	$ (57,053)

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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