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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]        
OPERATING REVENUES $ 413,182,184 $ 13,814,182 $ 371,092,421 $ 290,441,208
OPERATING COSTS 348,871,391 11,664,038 309,929,371 237,708,937
GROSS PROFIT 64,310,793 2,150,144 61,163,050 52,732,271
OPERATING EXPENSES        
Selling and marketing expenses 5,751,168 192,282 4,933,602 3,308,992
General and administrative expenses 16,637,887 556,265 14,618,900 12,458,054
Research and development expenses 18,395,334 615,023 14,962,799 11,746,613
Total operating expenses 40,784,389 1,363,570 34,515,301 27,513,659
OTHER OPERATING INCOME AND EXPENSES, NET (268,555) (8,979) 371,583 108,556
PROFIT FROM OPERATIONS 23,257,849 777,595 27,019,332 25,327,168
NON-OPERATING INCOME AND EXPENSES        
Other income 1,359,093 45,439 1,092,558 707,754
Other gains, net 2,683,989 89,735 7,874,273 6,259,453
Finance costs (4,203,395) (140,535) (3,568,241) (1,799,494)
Share of the profit or loss of associates and joint ventures 182,275 6,094 (480,244) 525,782
Total non-operating income and expenses 21,962 733 4,918,346 5,693,495
PROFIT BEFORE INCOME TAX 23,279,811 778,328 31,937,678 31,020,663
INCOME TAX EXPENSE 5,011,246 167,544 4,513,369 6,523,603
PROFIT FOR THE YEAR 18,268,565 610,784 27,424,309 24,497,060
Items that will not be reclassified subsequently to profit or loss:        
Remeasurement of defined benefit obligation (365,262) (12,212) (308,180) 205,344
Unrealized loss on equity instruments at fair value through other comprehensive income (216,121) (7,226) (422,441)  
Share of other comprehensive income (loss) of associates and joint ventures 1,504,760 50,310 (558,217) 7,249
Income tax relating to items that will not be reclassified subsequently to profit or loss (3,816) (128) 134,853 (51,217)
Items that will not be reclassified subsequently to profit or loss 919,561 30,744 (1,153,985) 161,376
Items that may be reclassified subsequently to profit or loss:        
Exchange differences on translating foreign operations (5,202,145) (173,927) 227,821 (5,287,734)
Unrealized gain on available-for-sale financial assets       224,036
Unrealized loss on investments in debt instruments at fair value through other comprehensive income (2,052) (69) (63,076)  
Share of other comprehensive income (loss) of associates and joint ventures (85,975) (2,874) 136,608 264,389
Items that may be reclassified subsequently to profit or loss (5,290,172) (176,870) 301,353 (4,799,309)
Other comprehensive loss for the year, net of income tax (4,370,611) (146,126) (852,632) (4,637,933)
TOTAL COMPREHENSIVE INCOME FOR THE YEAR 13,897,954 464,658 26,571,677 19,859,127
PROFIT FOR THE YEAR ATTRIBUTABLE TO:        
Owners of the Company 17,060,591 570,397 26,220,721 22,819,119
Non-controlling interests 1,207,974 40,387 1,203,588 1,677,941
PROFIT FOR THE YEAR 18,268,565 610,784 27,424,309 24,497,060
TOTAL COMPREHENSIVE INCOME FOR THE YEAR ATTRIBUTABLE TO:        
Owners of the Company 13,122,185 438,722 25,620,461 18,524,067
Non-controlling interests 775,769 25,936 951,216 1,335,060
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ 13,897,954 $ 464,658 $ 26,571,677 $ 19,859,127
EARNINGS PER SHARE        
Basic | (per share) $ 4.01 $ 0.13 $ 6.18 $ 5.59
Diluted | (per share) 3.91 0.13 6.07 5.19
American depositary shares [member]        
EARNINGS PER SHARE        
Basic | (per share) 8.02 0.27 12.35 11.18
Diluted | (per share) $ 7.82 $ 0.26 $ 12.14 $ 10.38