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