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Himax Technologies, Inc. (the Parent Company only) (Details 3) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:        
Net income   $ 25,818 $ 48,747 $ 21,462
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Gain on disposals of investment non-marketable equity securities, net   (23,038) 0 (1,682)
Changes in:        
Net cash provided by (used in) operating activities   29,393 84,672 22,529
Cash flows from investing activities:        
Purchases of available-for-sale marketable securities   (47,095) (30,248) (63,051)
Purchases of equity method investment   (9,175) (37) (3,708)
Proceeds from disposals of equity method investment $ 179 0 0 179
Net cash provided by (used in) investing activities   (35,088) (7,127) (28,342)
Cash flows from financing activities:        
Payments of cash dividends   (41,281) (22,348) (51,364)
Proceeds from short-term debt   151,161 230,000 412,303
Repayment of short-term debt   (142,161) (272,000) (362,303)
Net cash provided by (used in) financing activities   (41,214) (22,715) (49,608)
Net increase (decrease) in cash   (46,429) 54,623 (55,637)
Cash and cash equivalents at beginning of year 185,466 184,452 129,829 185,466
Cash and cash equivalents at end of year   138,023 184,452 129,829
Supplemental disclosures of cash flow information:        
Interest paid during the year   565 637 516
Income taxes paid during the year   14,683 11,534 12,505
Parent Company [Member]        
Cash flows from operating activities:        
Net income   27,967 50,912 25,195
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Equity in earnings from subsidiaries and affiliates   (30,355) (55,191) (20,820)
Gain on disposals of investment non-marketable equity securities, net   0 0 (1,682)
Changes in:        
Other current assets   478 491 221
Other current liabilities   (49) (100) 157
Net cash provided by (used in) operating activities   (1,959) (3,888) 3,071
Cash flows from investing activities:        
Purchases of available-for-sale marketable securities   (158) (173) (4,625)
Proceeds from disposals of investment in non-marketable equity securities   0 0 1,682
Purchases of equity method investment   0 0 (3,708)
Proceeds from disposals of equity method investment   4,825 64,513 0
Proceeds from capital reduction of investment   1,150 431 0
Cash received from (paid for) loan made to related party   4,400 (7,150) 0
Net cash provided by (used in) investing activities   10,217 57,621 (6,651)
Cash flows from financing activities:        
Payments of cash dividends   (41,281) (22,348) (51,364)
Proceeds from short-term debt   151,000 192,000 351,000
Repayment of short-term debt   (123,000) (234,000) (301,000)
Proceeds from issue of RSUs from subsidiaries   872 1,081 5,311
Proceeds from debt from a subsidiary   201,849 367,667 375,572
Repayment of debt from a subsidiary   (197,095) (358,910) (374,775)
Net cash provided by (used in) financing activities   (7,655) (54,510) 4,744
Net increase (decrease) in cash   603 (777) 1,164
Cash and cash equivalents at beginning of year $ 372 759 1,536 372
Cash and cash equivalents at end of year   1,362 759 1,536
Supplemental disclosures of cash flow information:        
Interest paid during the year   547 563 453
Income taxes paid during the year   $ 0 $ 0 $ 0