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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
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 operating activities:      
Depreciation and amortization 16,680 13,756 14,164
Bad debt expense 155 620 310
Share-based compensation expenses 1,098 1,186 1,818
Loss (gain) on disposals of property and equipment (26) 26 (2)
Gain on disposals of equity method investment 0 0 (88)
Gain on disposals of investment in non-marketable equity securities, net (23,038) 0 (1,682)
Gain on disposals of marketable securities, net (188) (10) (223)
Equity in losses of equity method investees 1,200 1,277 77
Deferred tax expense (benefit) (1,601) (1,978) 4,148
Inventories write downs 12,298 23,342 9,785
Changes in:      
Accounts receivable (1,998) (14,602) 41,656
Inventories 2,250 (1,716) (15,054)
Prepaid expenses and other current assets 862 (647) 2,067
Accounts payable (2,336) 17,846 (54,905)
Accounts payable to related party (576) 576 0
Income taxes payable (7,390) 1,389 (6,475)
Other payable to related party 2,200 0 0
Other accrued expenses and other current liabilities 4,678 (5,164) 5,987
Other liabilities (693) 24 (516)
Net cash provided by operating activities 29,393 84,672 22,529
Cash flows from investing activities:      
Purchases of property, plant and equipment (39,818) (7,902) (9,982)
Proceeds from disposals of property and equipment 115 9 8
Purchases of available-for-sale marketable securities (47,095) (30,248) (63,051)
Proceeds from disposals of available-for-sale marketable securities 47,119 38,532 46,720
Purchases of investment in non-marketable equity securities 0 (1,600) 0
Proceeds from disposals of investment in non-marketable equity securities 10,000 0 1,682
Proceeds from capital reduction of investment 132 568 0
Purchase of equity method investment (9,175) (37) (3,708)
Proceeds from disposals of equity method investment 0 0 179
Proceeds from (repayments of) refundable deposits, net (120) 461 (304)
Releases (pledges) of restricted marketable securities (146) 240 (227)
Cash paid for loan made to related parties (3,250) (7,150) 0
Cash received from loan made to related party 7,150 0 0
Cash received from the acquisition of Liqxtal, net of cash paid of $1,780 0 0 341
Net cash 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)
Excess tax benefits from share-based compensation 0 0 771
Proceeds from disposals of subsidiary shares to noncontrolling interests by Himax Imaging, Inc. 4 9 22
Purchases of subsidiary shares from noncontrolling interests (42) (376) (503)
Releases (pledges) of restricted cash, cash equivalents and marketable securities (for borrowing of short-term debt) (9,000) 42,000 (50,000)
Proceeds from issuances of new shares by subsidiaries 105 0 1,466
Proceeds from short-term debt 151,161 230,000 412,303
Repayments of short-term debt (142,161) (272,000) (362,303)
Net cash used in financing activities (41,214) (22,715) (49,608)
Effect of foreign currency exchange rate changes on cash and cash equivalents 480 (207) (216)
Net increase (decrease) in cash and cash equivalents (46,429) 54,623 (55,637)
Cash and cash equivalents at beginning of year 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 565 637 516
Income taxes 14,683 11,534 12,505
Supplemental disclosures of investing activities affecting both cash and non-cash items:      
Purchase of property, plant and equipment (54,215) (6,570) (10,567)
Increase (decrease) in payable for purchases of equipment and asset retirement obligations 14,397 (1,332) 585
Cash paid (39,818) (7,902) (9,982)
Proceeds from disposal of investment in non-marketable equity securities 32,000 0 1,682
Increase in other current assets for disposal of investment in non-marketable equity securities (22,000) 0 0
Cash received $ 10,000 $ 0 $ 1,682