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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
TWD ($)
$ / shares
Dec. 31, 2017
TWD ($)
$ / shares
Statement [LineItems]        
Revenue $ 20,337,881 $ 679,969 $ 18,480,027 $ 17,940,855
Cost of revenue (16,411,742) (548,704) (15,050,032) (14,703,729)
Gross profit 3,926,139 131,265 3,429,995 3,237,126
Research and development expenses (1,007,631) (33,689) (939,269) (985,873)
Sales and marketing expenses (56,076) (1,875) (53,451) (64,397)
General and administrative expenses (498,241) (16,658) (485,068) (639,809)
Other operating income (expenses), net 92,928 3,107 147,514 692,834
Operating profit 2,457,119 82,150 2,099,721 2,239,881
Finance costs (180,262) (6,027) (190,248) (217,283)
Share of loss of associates (154,926) (5,179) (300,101) (179,491)
Gain on disposal of investment in associates 973,609 32,551   16,929
Other non-operating income (expenses), net (73,287) (2,450) 173,070 (327,620)
Profit before income tax 3,022,253 101,045 1,782,442 1,532,416
Income tax expense (513,679) (17,174) (456,618) (550,487)
Profit from continuing operations 2,508,574 83,871 1,325,824 981,929
Profit from discontinued operations 1,814,953
Profit for the year 2,508,574 83,871 1,325,824 2,796,882
Other comprehensive income (loss) that will be reclassified to profit or loss in subsequent periods:        
Exchange differences on translation of foreign operations (104,198) (3,484) (51,077) (232,652)
Share of other comprehensive income of associates that will be reclassified to profit or loss 678
Net other comprehensive loss that will be reclassified to profit or loss in subsequent periods (104,198) (3,484) (51,077) (231,974)
Other comprehensive income (loss) that will not be reclassified to profit or loss in subsequent periods:        
Other comprehensive income (loss) on remeasurements of defined benefit plans 20,916 699 (59,961) 50,838
Unrealized gain (loss) on valuation of equity instruments at fair value through other comprehensive income (52,549) (1,757) 85,022  
Share of other comprehensive loss of associates that will not be reclassified to profit or loss 5,732 192 (2,687) (124)
Income tax effect that will not be reclassified to profit or loss 2,833 95 (4,126) (8,642)
Net other comprehensive income (loss) that will not be reclassified to profit or loss in subsequent periods (23,068) (771) 18,248 42,072
Other comprehensive loss for the year, net of income tax (127,266) (4,255) (32,829) (189,902)
Total comprehensive income (loss) 2,381,308 79,616 1,292,995 2,606,980
Profit attributable to:        
Equity holders of the Company - Continuing operations 2,508,574 83,871 1,325,824 981,929
Equity holders of the Company - Discontinued operations 1,814,953
Profit for the year 2,508,574 83,871 1,325,824 2,796,882
Total comprehensive income attributable to:        
Equity holders of the Company - Continuing operations 2,381,308 79,616 1,292,995 1,079,672
Equity holders of the Company - Discontinued operations 1,527,308
Total comprehensive income (loss) $ 2,381,308 $ 79,616 $ 1,292,995 $ 2,606,980
Ordinary shares [member]        
Basic earnings per share:        
Equity holders of the Company - Continuing operations | (per share) $ 3.45 $ 0.12 $ 1.65 $ 1.16
Equity holders of the Company - Discontinued operations | (per share) 2.14
Equity holders of the Company | (per share) 3.45 0.12 1.65 3.30
Diluted earnings per share:        
Equity holders of the Company - Continuing operations | (per share) 3.40 0.11 1.63 1.13
Equity holders of the Company - Discontinued operations | (per share) 2.10
Equity holders of the Company | (per share) 3.40 0.11 1.63 3.23
American depositary share (each representing 20 common shares) [member]        
Basic earnings per share:        
Equity holders of the Company - Continuing operations | (per share) 69.00 2.31 33.03 23.20
Equity holders of the Company - Discontinued operations | (per share) 42.87
Equity holders of the Company | (per share) 69.00 2.31 33.03 66.07
Diluted earnings per share:        
Equity holders of the Company - Continuing operations | (per share) 68.06 2.28 32.59 22.68
Equity holders of the Company - Discontinued operations | (per share) 41.93
Equity holders of the Company | (per share) $ 68.06 $ 2.28 $ 32.59 $ 64.61