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Related-party Transactions (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Sales to INX and its affiliates $ 86,555 $ 251,974 $ 258,156
Display driver for large-size applications [Member]
     
Related Party Transaction [Line Items]      
Sales to INX and its affiliates 54,813 190,963 210,137
Display driver for consumer electronics applications [Member]
     
Related Party Transaction [Line Items]      
Sales to INX and its affiliates 24,965 40,582 29,316
Display driver for mobile handsets [Member]
     
Related Party Transaction [Line Items]      
Sales to INX and its affiliates 1,863 14,748 14,454
Others [Member]
     
Related Party Transaction [Line Items]      
Sales to INX and its affiliates $ 4,914 $ 5,681 $ 4,249