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Segment Information, Long Lived Assets by Major Market (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | $ 464,587 | $ 444,732 | $ 454,537
Major Markets [Member] | United States [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 302,884 | 283,868 | 271,058
Major Markets [Member] | Mainland China [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 97,046 | 97,867 | 110,839
Major Markets [Member] | South Korea [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 42,211 | 41,545 | 48,702
Major Markets [Member] | Japan [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 9,342 | 11,517 | 13,587
Major Markets [Member] | All Others [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | $ 13,104 | $ 9,935 | $ 10,351

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