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SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets $ 450,607 $ 444,732
Major Markets [Member] | United States [Member]    
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets 289,228 283,868
Major Markets [Member] | Mainland China [Member]    
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets 95,458 97,867
Major Markets [Member] | South Korea [Member]    
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets 44,280 41,545
Major Markets [Member] | Japan [Member]    
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets 11,250 11,517
Major Markets [Member] | All Other Countries [Member]    
Long-Lived Assets by Major Market [Abstract]    
Long-lived assets $ 10,391 $ 9,935