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SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 503,452 | $ 464,587
Major Markets [Member] | United States [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 357,043 | 302,884
Major Markets [Member] | Mainland China [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 89,529 | 97,046
Major Markets [Member] | South Korea [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 37,462 | 42,211
Major Markets [Member] | Japan [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 8,122 | 9,342
Major Markets [Member] | All Others [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 11,296 | $ 13,104

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