SEGMENT INFORMATION, Significant Geographical Areas and Long Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Revenue	$ 604,162	$ 571,308	$ 1,676,468	$ 1,674,849
Mainland China [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Long-lived assets	101,482		101,482		$ 110,839
South Korea [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Long-lived assets	46,960		46,960		48,702
Japan [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Long-lived assets	13,910		13,910		13,587
United States [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Long-lived assets	278,994		278,994		$ 271,057
Significant Geographic Area [Member] | Mainland China [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Revenue	168,320	138,050	471,319	421,498
Significant Geographic Area [Member] | South Korea [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Revenue	136,188	104,012	315,342	321,812
Significant Geographic Area [Member] | Japan [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Revenue	72,489	63,736	210,429	190,945
Significant Geographic Area [Member] | United States [Member]
Revenue by Geographical Area and Long-Lived Assets [Abstract]
Revenue	$ 51,714	$ 52,720	$ 148,975	$ 170,288