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Segment, Product and Geographic Information (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 685,167 $ 802,917 $ 691,789
Display drivers for large-size applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 224,798 272,906 224,423
Display drivers for mobile handsets applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 113,591 191,845 170,705
Display drivers for consumer electronics applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 191,458 177,114 165,271
Others [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 155,320 $ 161,052 $ 131,390