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Segment, Product and Geographic Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Segment revenues $ 887,282 $ 671,835 $ 723,605
Segment operating income (loss) 57,926 (18,307) 3,385
Non operating income, net (1,054) 2,539 3,635
Consolidated profits before income taxes 56,872 (15,768) 7,020
Significant noncash items:      
Share-based compensation 763 457 408
Depreciation and amortization 23,596 24,399 20,327
Driver IC [Member]      
Disclosure of operating segments [line items]      
Segment revenues 756,522 544,727 586,258
Segment operating income (loss) 98,687 29,070 56,023
Significant noncash items:      
Share-based compensation 481 221 189
Depreciation and amortization 5,959 5,511 3,248
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Segment revenues 130,760 127,108 137,347
Segment operating income (loss) (40,761) (47,377) (52,638)
Significant noncash items:      
Share-based compensation 282 236 219
Depreciation and amortization $ 17,637 $ 18,888 $ 17,079