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SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
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