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SEGMENT INFORMATION, Significant Geographical Areas and Long Lived Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Revenue $ 600,475 $ 560,209 $ 1,072,306 $ 1,103,541  
Mainland China [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Long-lived assets 104,319   104,319   $ 110,839
South Korea [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Long-lived assets 46,449   46,449   48,702
Japan [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Long-lived assets 14,592   14,592   13,587
United States [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Long-lived assets 276,931   276,931   $ 271,057
Significant Geographic Area [Member] | Mainland China [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Revenue 184,344 149,251 302,999 283,448  
Significant Geographic Area [Member] | South Korea [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Revenue 93,036 109,023 179,154 217,800  
Significant Geographic Area [Member] | Japan [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Revenue 72,849 63,920 137,940 127,209  
Significant Geographic Area [Member] | United States [Member]          
Revenue by Geographical Area and Long-Lived Assets [Abstract]          
Revenue $ 50,028 $ 58,580 $ 97,261 $ 117,568