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Segment, Product and Geographic Information - Segment revenues from major product lines (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Revenue $ 671,835 $ 723,605 $ 685,167
Large-size application [Member]      
Disclosure of operating segments [line items]      
Revenue 237,276 260,540 224,798
Mobile Handsets Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 114,956 112,221 113,591
Consumer Electronics Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 192,495 213,497 191,458
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 127,108 137,347 155,320
Driver IC [Member]      
Disclosure of operating segments [line items]      
Revenue 544,727 586,258 529,847
Driver IC [Member] | Large-size application [Member]      
Disclosure of operating segments [line items]      
Revenue 237,276 260,540 224,798
Driver IC [Member] | Mobile Handsets Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 114,956 112,221 113,591
Driver IC [Member] | Consumer Electronics Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 192,495 213,497 191,458
Driver IC [Member] | Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 127,108 137,347 155,320
Non-driver products [Member] | Large-size application [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member] | Mobile Handsets Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member] | Consumer Electronics Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member] | Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue $ 127,108 $ 137,347 $ 155,320