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SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 449,555 | $ 444,732
Major Markets [Member] | United States [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 294,567 | 283,868
Major Markets [Member] | Mainland China [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 93,108 | 97,867
Major Markets [Member] | South Korea [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 40,446 | 41,545
Major Markets [Member] | Japan [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 9,447 | 11,517
Major Markets [Member] | All Other Countries [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 11,987 | $ 9,935

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