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Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Contribution [Abstract]
Operating income	$ 240,860	$ 274,483	$ 231,104
Other income (expense)	(21,194)	(8,916)	(18,265)
Income before provision for income taxes	219,666	265,567	212,839
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income	596,685	518,849	473,610
Operating Segment [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Operating income	253,598	211,625	135,174
Operating Segment [Member] | Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income	52,433	51,885	47,803
Operating Segment [Member] | South Korea [Member]
Segment Contribution [Abstract]
Operating income	107,215	100,964	117,142
Operating Segment [Member] | Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income	78,598	63,296	67,952
Operating Segment [Member] | Japan [Member]
Segment Contribution [Abstract]
Operating income	56,676	51,372	59,175
Operating Segment [Member] | Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income	33,392	27,958	35,978
Operating Segment [Member] | EMEA [Member]
Segment Contribution [Abstract]
Operating income	14,773	11,749	10,386
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income	$ (355,825)	$ (244,366)	$ (242,506)

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.

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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).

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