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Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Contribution [Abstract]
Operating income	$ 274,483	$ 231,104	$ 244,702
Other income (expense)	(8,916)	(18,265)	(32,743)
Income before provision for income taxes	265,567	212,839	211,959
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income	518,849	473,610	438,895
Operating Segment [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Operating income	211,625	135,174	73,422
Operating Segment [Member] | South Korea [Member]
Segment Contribution [Abstract]
Operating income	100,964	117,142	130,516
Operating Segment [Member] | Americas [Member]
Segment Contribution [Abstract]
Operating income	47,040	44,390	62,937
Operating Segment [Member] | South Asia/Pacific [Member]
Segment Contribution [Abstract]
Operating income	68,141	71,365	68,949
Operating Segment [Member] | Japan [Member]
Segment Contribution [Abstract]
Operating income	51,372	59,175	51,181
Operating Segment [Member] | Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income	27,958	35,978	40,718
Operating Segment [Member] | EMEA [Member]
Segment Contribution [Abstract]
Operating income	11,749	10,386	11,172
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income	$ (244,366)	$ (242,506)	$ (194,193)

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
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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