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Himax Technologies, Inc. (the Parent Company only) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash $ 138,023 $ 184,452 $ 129,829 $ 185,466
Investments in marketable securities available-for-sale 10,879 10,157    
Other receivable from related party 3,250 7,150    
Total assets 802,055 799,634    
Current liabilities 337,199 324,746    
Short-term debt 147,000 138,000    
Total equity 454,913 468,151 441,341 468,297
Total liabilities and equity 802,055 799,634    
Parent Company [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash 1,362 759 $ 1,536 $ 372
Investments in marketable securities available-for-sale 4,881 4,399    
Other receivable from related party 2,751 7,150    
Other current assets 498 976    
Investments in subsidiaries and affiliates 753,315 727,903    
Total assets 762,807 741,187    
Current liabilities 235 284    
Short-term debt 147,000 119,000    
Debt borrowing from a subsidiary 158,924 154,170    
Total equity 456,648 467,733    
Total liabilities and equity $ 762,807 $ 741,187