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Capital management (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital management        
Total liabilities $ 387,237 $ 394,391    
Less: cash and cash equivalents 101,055 106,437 $ 138,023 $ 184,452
Total liabilities less current assets 286,182 287,954    
Equity attributable to owners of Himax Technologies, Inc. $ 432,987 $ 446,548