SEGMENT INFORMATION, Significant Geographical Areas and Long Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenue by geographical area and long-lived assets [Abstract]
Revenue	$ 471,831	$ 543,332
Japan [Member]
Revenue by geographical area and long-lived assets [Abstract]
Revenue	65,091	63,289
Long-lived assets	14,150		$ 13,587
Mainland China [Member]
Revenue by geographical area and long-lived assets [Abstract]
Revenue	118,655	134,197
Long-lived assets	110,259		110,839
South Korea [Member]
Revenue by geographical area and long-lived assets [Abstract]
Revenue	86,118	108,777
Long-lived assets	48,653		48,702
United States [Member]
Revenue by geographical area and long-lived assets [Abstract]
Revenue	47,233	58,988
Long-lived assets	269,618		$ 271,057
Europe [Member]
Revenue by geographical area and long-lived assets [Abstract]
Revenue	$ 32,585	$ 33,210