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Summary of Significant Accounting Policies (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Noncontrolling Interest [Line Items]      
Net income attributable to Himax Technologies, Inc. stockholders $ 27,967 $ 50,912 $ 25,195
Transfers (to) from the noncontrolling interests:      
Increase in Himax Technologies, Inc.’s paid-in capital for sale of shares of subsidiaries 5 9 32
Decrease in Himax Technologies, Inc.’s paid-in capital and retained earnings for purchase of shares of subsidiaries (10) (229) (1,036)
Change from net income attributable to Himax Technologies, Inc. stockholders and transfers from noncontrolling interests $ 27,962 $ 50,692 $ 24,191