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Segment, Product and Geographic Information (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 770,739 $ 737,255 $ 633,021
Display drivers for large-size applications [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 228,927 305,247 270,372
Display drivers for mobile handsets applications [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 232,019 177,175 169,248
Display drivers for consumer electronics applications [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 183,554 151,689 112,836
Others [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 126,239 $ 103,144 $ 80,565