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Himax Technologies, Inc. (the Parent Company only) (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Comprehensive Income Caption [Line Items]      
Net income $ 25,818 $ 48,747 $ 21,462
Other comprehensive income (loss):      
Unrealized gains (losses) on securities, not subject to income tax: 322 (71) (294)
Unrealized holding gains (losses) on available-for-sale marketable securities arising during the period 510 (61) (71)
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil (188) (10) (223)
Foreign currency translation adjustments, net of income tax of nil 862 (479) (573)
Net unrecognized actuarial gain (loss), net of income tax of $(168), $6 and $(25) in 2015, 2016 and 2017, respectively (150) 1 (778)
Comprehensive income 26,852 48,198 19,817
Parent Company [Member]      
Condensed Comprehensive Income Caption [Line Items]      
Net income 27,967 50,912 25,195
Other comprehensive income (loss):      
Unrealized gains (losses) on securities, not subject to income tax: 313 (115) (259)
Unrealized holding gains (losses) on available-for-sale marketable securities arising during the period 466 (118) (63)
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil (153) 3 (196)
Foreign currency translation adjustments, net of income tax of nil 862 (479) (573)
Net unrecognized actuarial gain (loss), net of income tax of $(168), $6 and $(25) in 2015, 2016 and 2017, respectively (138) 6 (731)
Comprehensive income $ 29,004 $ 50,324 $ 23,632