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Segment, Product and Geographic Information (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 691,789 $ 840,542 $ 770,739
Display drivers for large-size applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 224,423 226,087 228,927
Display drivers for mobile handsets applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 170,705 238,467 232,019
Display drivers for consumer electronics applications [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 165,271 207,514 183,554
Others [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 131,390 $ 168,474 $ 126,239