SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 496,704	$ 464,587
Major Markets [Member] | United States [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	357,426	302,884
Major Markets [Member] | Mainland China [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	84,680	97,046
Major Markets [Member] | South Korea [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	36,609	42,211
Major Markets [Member] | Japan [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	7,195	9,342
Major Markets [Member] | All Others [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 10,794	$ 13,104