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Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Contribution [Abstract] |  |  |
Operating income | $ 274,483 | $ 231,104 | $ 244,702
Other income (expense) | (8,916) | (18,265) | (32,743)
Income before provision for income taxes | 265,567 | 212,839 | 211,959
Operating Segment [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 518,849 | 473,610 | 438,895
Operating Segment [Member] | Mainland China [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 211,625 | 135,174 | 73,422
Operating Segment [Member] | South Korea [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 100,964 | 117,142 | 130,516
Operating Segment [Member] | Americas [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 47,040 | 44,390 | 62,937
Operating Segment [Member] | South Asia/Pacific [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 68,141 | 71,365 | 68,949
Operating Segment [Member] | Japan [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 51,372 | 59,175 | 51,181
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 27,958 | 35,978 | 40,718
Operating Segment [Member] | EMEA [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | 11,749 | 10,386 | 11,172
Corporate and Other [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Operating income | $ (244,366) | $ (242,506) | $ (194,193)

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