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Segment Information, Significant Geographical Areas and Long Lived Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue $ 2,207,797 $ 2,247,047 $ 2,569,495
Significant Geographic Area [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue 2,207,797 2,247,047 2,569,495
Significant Geographic Area [Member] | Mainland China [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue 610,414 565,527 675,082
Long-lived assets 97,867 110,839  
Significant Geographic Area [Member] | South Korea [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue 413,696 422,341 467,720
Long-lived assets 41,545 48,702  
Significant Geographic Area [Member] | Japan [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue 279,042 264,214 315,265
Long-lived assets 11,517 13,587  
Significant Geographic Area [Member] | United States [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue 201,239 243,748 230,767
Long-lived assets 283,868 271,057  
Significant Geographic Area [Member] | Europe [Member]      
Revenue by Geographical Area and Long-Lived Assets [Abstract]      
Revenue $ 147,318 $ 137,186 $ 180,572