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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)

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