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Segment Information, Long Lived Assets by Major Market (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | $ 632,670 | $ 597,930 | $ 464,535
Major Market [Member] | United States [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 348,028 | 354,410 | 317,516
Major Market [Member] | Mainland China [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 152,312 | 136,845 | 89,447
Major Market [Member] | South Korea [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 39,104 | 35,286 | 36,325
Major Market [Member] | Japan [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | 31,085 | 12,015 | 6,864
Major Market [Member] | All Others [Member] |  |  |
Long-Lived Assets by Major Market [Abstract] |  |  |
Long-lived assets | $ 62,141 | $ 59,374 | $ 14,383

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