SEGMENT INFORMATION, Long-Lived Assets by Major Market (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 450,707	$ 444,732
Major Markets [Member] | United States [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	291,906	283,868
Major Markets [Member] | Mainland China [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	93,855	97,867
Major Markets [Member] | South Korea [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	41,748	41,545
Major Markets [Member] | Japan [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	10,261	11,517
Major Markets [Member] | All Other Countries [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 12,937	$ 9,935