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SEGMENT INFORMATION, Segment Contribution (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Contribution [Abstract] |  |  |  |
Operating income | $ 64,739 | $ 79,798 | $ 111,001 | $ 87,947
Other income (expense) | (2,731) | (11,060) | (7,298) | (13,923)
Income before provision for income taxes | 62,008 | 68,738 | 103,703 | 74,024
Operating Segment [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 122,951 | 143,265 | 226,266 | 229,300
Operating Segment [Member] | Mainland China [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 52,283 | 56,709 | 87,710 | 75,010
Operating Segment [Member] | South Korea [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 22,278 | 24,195 | 46,790 | 48,252
Operating Segment [Member] | Americas [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 11,646 | 12,177 | 21,742 | 22,649
Operating Segment [Member] | South Asia Pacific [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 14,439 | 24,348 | 28,419 | 36,801
Operating Segment [Member] | Japan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 10,922 | 15,933 | 23,348 | 27,980
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 7,766 | 7,070 | 12,849 | 15,428
Operating Segment [Member] | EMEA [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | 3,617 | 2,833 | 5,408 | 3,180
Corporate and Other [Member] |  |  |  |
Segment Contribution [Abstract] |  |  |  |
Operating income | $ (58,212) | $ (63,467) | $ (115,265) | $ (141,353)

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