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Related-party Transactions (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sales to CMO/CMI and its affiliates $ 251,974 $ 258,156 $ 335,595
Display driver for large-size applications [Member]
     
Sales to CMO/CMI and its affiliates 190,963 210,137 297,146
Display driver for consumer electronics applications [Member]
     
Sales to CMO/CMI and its affiliates 40,582 29,316 27,189
Display driver for mobile handsets [Member]
     
Sales to CMO/CMI and its affiliates 14,748 14,454 10,170
Others [Member]
     
Sales to CMO/CMI and its affiliates $ 5,681 $ 4,249 $ 1,090