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SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 450,707 | $ 444,732
Major Markets [Member] | United States [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 291,906 | 283,868
Major Markets [Member] | Mainland China [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 93,855 | 97,867
Major Markets [Member] | South Korea [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 41,748 | 41,545
Major Markets [Member] | Japan [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | 10,261 | 11,517
Major Markets [Member] | All Other Countries [Member] |  |
Long-Lived Assets by Major Market [Abstract] |  |
Long-lived assets | $ 12,937 | $ 9,935

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