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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Contribution [Abstract] |  |
Operating income | $ 58,990 | $ 46,262
Other income (expense) | 1,207 | (4,567)
Income before provision for income taxes | 60,197 | 41,695
Operating Segment [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 122,430 | 103,315
Operating Segment [Member] | Mainland China [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 44,817 | 35,427
Operating Segment [Member] | Americas/Pacific [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 9,172 | 11,059
Operating Segment [Member] | South Korea [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 26,201 | 24,512
Operating Segment [Member] | Southeast Asia [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 16,402 | 13,017
Operating Segment [Member] | Japan [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 13,238 | 12,426
Operating Segment [Member] | EMEA [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 4,754 | 1,791
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | 7,846 | 5,083
Corporate and Other [Member] |  |
Segment Contribution [Abstract] |  |
Operating income | $ (63,440) | $ (57,053)

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