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Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income attributable to Himax Technologies, Inc. stockholders $ 51,596 $ 10,706 $ 33,206
Denominator for basic earnings per ordinary share:      
Weighted average number of ordinary shares outstanding (in thousands) 341,056 353,771 355,037
Diluted earnings per ordinary share attributable to Himax Technologies, Inc. stockholders (in dollars per share) $ 0.15 $ 0.03 $ 0.09