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Segment, Product and Geographic Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Segment revenues $ 671,835 $ 723,605 $ 685,167
Segment operating income (loss) (18,307) 3,385 8,359
Non operating income, net 2,539 3,635 21,733
Consolidated profits before income taxes (15,768) 7,020 30,092
Significant noncash items:      
Share Based Compensation 457 408 997
Depreciation and amortization 24,399 20,327 16,680
Driver IC [Member]      
Disclosure of operating segments [line items]      
Segment revenues 544,727 586,258 529,847
Segment operating income (loss) 29,070 56,023 43,021
Significant noncash items:      
Share Based Compensation 221 189 365
Depreciation and amortization 5,511 3,248 4,940
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Segment revenues 127,108 137,347 155,320
Segment operating income (loss) (47,377) (52,638) (34,662)
Significant noncash items:      
Share Based Compensation 236 219 632
Depreciation and amortization $ 18,888 $ 17,079 $ 11,740