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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
TWD ($)
$ / shares
Dec. 31, 2018
TWD ($)
$ / shares
Statement [LineItems]        
Revenue $ 23,011,381 $ 819,493 $ 20,337,881 $ 18,480,027
Cost of revenue (17,979,208) (640,285) (16,411,742) (15,050,032)
Gross profit 5,032,173 179,208 3,926,139 3,429,995
Sales and marketing expenses (56,978) (2,029) (56,076) (53,451)
General and administrative expenses (528,759) (18,830) (498,241) (485,068)
Research and development expenses (1,015,512) (36,165) (1,007,631) (939,269)
Other income (expenses), net 135,578 4,828 92,928 147,514
Operating profit 3,566,502 127,012 2,457,119 2,099,721
Interest income 27,778 989 64,368 49,971
Other income 21,157 753 10,759 8,390
Other gains and losses (323,267) (11,512) (148,414) 114,709
Finance costs (171,482) (6,107) (180,262) (190,248)
Share of loss of associates and joint ventures accounted for using equity method (147,329) (5,247) (154,926) (300,101)
Gain on disposal of investment accounted for using equity method     973,609  
Profit before income tax 2,973,359 105,888 3,022,253 1,782,442
Income tax expense (594,381) (21,167) (513,679) (456,618)
Profit for the year 2,378,978 84,721 2,508,574 1,325,824
Other comprehensive income (loss):        
(Loss) profit on remeasurements of defined benefit plans (51,990) (1,851) 20,916 (59,961)
Unrealized gain (loss) on valuation of equity instruments at fair value through other comprehensive income 140,199 4,993 (52,549) 85,022
Share of other comprehensive (loss) income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss 23,143 824 5,732 (2,687)
Income tax effect on components that will not be reclassified to profit or loss (24,396) (869) 2,833 (4,126)
Net other comprehensive income (loss) that will not be reclassified to profit or loss in subsequent periods 86,956 3,097 (23,068) 18,248
Exchange differences on translation of foreign operations 28,352 1,010 (104,198) (51,077)
Net other comprehensive (loss) income that will be reclassified to profit or loss in subsequent periods 28,352 1,010 (104,198) (51,077)
Other comprehensive (loss) income for the year, net of income tax 115,308 4,107 (127,266) (32,829)
Total comprehensive income for the year, net of income tax $ 2,494,286 $ 88,828 $ 2,381,308 $ 1,292,995
Ordinary shares [member]        
Other comprehensive income (loss):        
Earnings per share — basic | (per share) $ 3.27 $ 0.12 $ 3.45 $ 1.65
Earnings per share — diluted | (per share) 3.23 0.11 3.40 1.63
American depositary share (each representing 20 common shares) [member]        
Other comprehensive income (loss):        
Earnings per share — basic | (per share) 65.42 2.33 69.00 33.03
Earnings per share — diluted | (per share) $ 64.57 $ 2.30 $ 68.06 $ 32.59