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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Contribution [Abstract] |  |  |  |
Operating income | $ 80,675 | $ 64,362 | $ 222,429 | $ 175,363
Other income (expense) | (6,982) | (1,172) | (16,940) | (8,470)
Income before provision for income taxes | 73,693 | 63,190 | 205,489 | 166,893
Operating Segment [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 154,867 | 121,352 | 438,066 | 347,618
Operating Segment [Member] | Mainland China [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 71,185 | 42,375 | 189,901 | 130,085
Operating Segment [Member] | Americas/Pacific [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 11,848 | 14,106 | 38,088 | 37,884
Operating Segment [Member] | South Korea [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 24,754 | 23,713 | 75,836 | 70,503
Operating Segment [Member] | Southeast Asia [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 21,204 | 17,380 | 58,245 | 43,763
Operating Segment [Member] | Japan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 15,162 | 12,786 | 41,777 | 36,134
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 8,100 | 8,096 | 23,781 | 20,945
Operating Segment [Member] | EMEA [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 2,614 | 2,896 | 10,438 | 8,304
Corporate and Other [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | $ (74,192) | $ (56,990) | $ (215,637) | $ (172,255)

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