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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Contribution [Abstract] |  |  |  |
Operating income | $ 64,362 | $ 82,374 | $ 175,363 | $ 170,321
Other income (expense) | (1,172) | (5,695) | (8,470) | (19,618)
Income before provision for income taxes | 63,190 | 76,679 | 166,893 | 150,703
Operating Segment [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 121,352 | 137,156 | 347,618 | 366,456
Operating Segment [Member] | Mainland China [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 42,375 | 38,240 | 130,085 | 113,250
Operating Segment [Member] | South Korea [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 23,713 | 41,739 | 70,503 | 89,991
Operating Segment [Member] | Americas [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 12,822 | 11,637 | 34,564 | 34,286
Operating Segment [Member] | South Asia/Pacific [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 18,664 | 16,371 | 47,083 | 53,172
Operating Segment [Member] | Japan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 12,786 | 15,510 | 36,134 | 43,490
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 8,096 | 10,401 | 20,945 | 25,829
Operating Segment [Member] | EMEA [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 2,896 | 3,258 | 8,304 | 6,438
Corporate and Other [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | $ (56,990) | $ (54,782) | $ (172,255) | $ (196,135)

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