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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]        
OPERATING REVENUES $ 476,978,710 $ 16,986,421 $ 413,182,184 $ 371,092,421
OPERATING COSTS 398,994,442 14,209,204 348,871,391 309,929,371
GROSS PROFIT 77,984,268 2,777,217 64,310,793 61,163,050
OPERATING EXPENSES        
Selling and marketing expenses 5,605,464 199,625 5,751,168 4,933,602
General and administrative expenses 18,200,304 648,159 16,637,887 14,618,900
Research and development expenses 19,302,418 687,408 18,395,334 14,962,799
Total operating expenses 43,108,186 1,535,192 40,784,389 34,515,301
OTHER OPERATING INCOME AND EXPENSES, NET 502,492 17,895 (268,555) 371,583
PROFIT FROM OPERATIONS 35,378,574 1,259,920 23,257,849 27,019,332
NON-OPERATING INCOME AND EXPENSES        
Other income 1,474,547 52,512 1,359,093 1,092,558
Other gains and losses 1,827,576 65,085 2,683,989 7,874,273
Finance costs (3,459,511) (123,202) (4,203,395) (3,568,241)
Share of the profit or loss of associates and joint ventures 547,612 19,502 182,275 (480,244)
Total non-operating income and expenses 390,224 13,897 21,962 4,918,346
PROFIT BEFORE INCOME TAX 35,768,798 1,273,817 23,279,811 31,937,678
INCOME TAX EXPENSE 7,116,898 253,451 5,011,246 4,513,369
PROFIT FOR THE YEAR 28,651,900 1,020,366 18,268,565 27,424,309
Items that will not be reclassified subsequently to profit or loss:        
Remeasurement of defined benefit obligation (594,778) (21,181) (365,262) (308,180)
Unrealized loss on equity instruments at fair value through other comprehensive income (166,239) (5,920) (216,121) (422,441)
Share of other comprehensive income (loss) of associates and joint ventures 2,656,966 94,621 1,504,760 (558,217)
Income tax relating to items that will not be reclassified subsequently to profit or loss (122,901) (4,377) (3,816) 134,853
Items that will not be reclassified subsequently to profit or loss 1,773,048 63,143 919,561 (1,153,985)
Items that may be reclassified subsequently to profit or loss:        
Exchange differences on translating foreign operations (831,784) (29,622) (5,202,145) 227,821
Unrealized loss on investments in debt instruments at fair value through other comprehensive income (2,136) (76) (2,052) (63,076)
Loss on hedging instruments (574,824) (20,471)    
Share of other comprehensive income (loss) of associates and joint ventures 131,009 4,666 (85,975) 136,608
Items that may be reclassified subsequently to profit or loss (1,277,735) (45,503) (5,290,172) 301,353
Other comprehensive income (loss) for the year, net of income tax 495,313 17,640 (4,370,611) (852,632)
TOTAL COMPREHENSIVE INCOME FOR THE YEAR 29,147,213 1,038,006 13,897,954 26,571,677
PROFIT FOR THE YEAR ATTRIBUTABLE TO:        
Owners of the Company 26,970,580 960,490 17,060,591 26,220,721
Non-controlling interests 1,681,320 59,876 1,207,974 1,203,588
PROFIT FOR THE YEAR 28,651,900 1,020,366 18,268,565 27,424,309
TOTAL COMPREHENSIVE INCOME FOR THE YEAR ATTRIBUTABLE TO:        
Owners of the Company 27,440,726 977,234 13,122,185 25,620,461
Non-controlling interests 1,706,487 60,772 775,769 951,216
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ 29,147,213 $ 1,038,006 $ 13,897,954 $ 26,571,677
EARNINGS PER SHARE        
Basic | (per share) $ 6.32 $ 0.23 $ 4.01 $ 6.18
Diluted | (per share) 6.17 0.22 3.91 6.07
American depositary shares [member]        
EARNINGS PER SHARE        
Basic | (per share) 12.65 0.45 8.02 12.35
Diluted | (per share) $ 12.33 $ 0.44 $ 7.82 $ 12.14