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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic and Diluted Earnings per Ordinary Share [Line Items]      
Net income attributable to Himax Technologies, Inc. stockholders $ 27,967 $ 50,912 $ 25,195
Denominator for basic earnings per ordinary share:      
Weighted average number of ordinary shares outstanding 344,849 344,655 343,570
Basic earnings per ordinary share attributable to Himax Technologies, Inc. stockholders (in dollars per share) $ 0.08 $ 0.15 $ 0.07
Net income attributable to Himax Technologies, Inc. stockholders $ 27,967 $ 50,912 $ 25,195
Denominator for diluted earnings per ordinary share:      
Weighted average number of ordinary shares outstanding 344,849 344,655 343,570
Unvested RSUs 54 69 562
Weighted Average Number of Shares Outstanding, Diluted 344,903 344,724 344,132
Diluted earnings per ordinary share attributable to Himax Technologies, Inc. stockholders (in dollars per share) $ 0.08 $ 0.15 $ 0.07