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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Contribution [Abstract]
Operating income	$ 82,764	$ 64,739	$ 141,754	$ 111,001
Other income (expense)	(11,165)	(2,731)	(9,958)	(7,298)
Income before provision for income taxes	71,599	62,008	131,796	103,703
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income	160,767	122,951	283,197	226,266
Operating Segment [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Operating income	73,899	52,283	118,716	87,710
Operating Segment [Member] | Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income	17,068	12,718	26,240	23,777
Operating Segment [Member] | South Korea [Member]
Segment Contribution [Abstract]
Operating income	24,880	22,278	51,081	46,790
Operating Segment [Member] | Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income	20,639	13,367	37,041	26,384
Operating Segment [Member] | Japan [Member]
Segment Contribution [Abstract]
Operating income	13,377	10,922	26,615	23,348
Operating Segment [Member] | Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income	7,835	7,766	15,681	12,849
Operating Segment [Member] | EMEA [Member]
Segment Contribution [Abstract]
Operating income	3,069	3,617	7,823	5,408
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income	$ (78,003)	$ (58,212)	$ (141,443)	$ (115,265)

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

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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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