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Consolidated Statements of Cash Flows
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Cash flows from operating activities        
Profit before income tax $ 2,973,359 $ 105,888 $ 3,022,253 $ 1,782,442
Adjustments to reconcile profit (loss)        
Depreciation expenses 4,175,519 148,701 3,731,914 3,376,579
Expected (reversal of) credit losses 264 10 (806) 348
Interest expense 162,400 5,783 171,075 152,416
Interest income (27,778) (989) (64,368) (49,971)
Dividend income (3,229) (115) (585) (571)
Share-based payments     822 41,043
Share of loss of associates and joint ventures accounted for using equity method 147,329 5,247 154,926 300,101
Gain on valuation of financial assets at fair value through profit or loss (24,015) (855) (1,317) (1,485)
Gain on disposal of property, plant and equipment, net (48,070) (1,712) (20,271) (14,274)
Insurance compensation income     (10,435) (147)
Impairment loss on property, plant and equipment     9,938  
Gain on disposal of investment accounted for using equity method     (973,609)  
Deferred revenue (10,143) (361) (12,279) (42,857)
Financial assets at fair value through profit or loss (28,435) (1,013) 1,750 1,447
Current contract assets (11,150) (397) (78,013) (44,858)
Accounts and notes receivable (911,355) (32,456) 294,409 (733,695)
Accounts receivable – related parties 1,045 37 (905) (129)
Other receivables 13,529 482 (8,082) 5,238
Other receivables – related parties 4,923 175 12,437 16,317
Inventories (334,433) (11,910) 11,193 (58,101)
Prepayments (10,485) (373) (4,333) 46,781
Other non-current assets 6,337 226 6,914 6,914
Current contract liabilities (1,231) (44) (201) 280
Accounts and notes payable 170,172 6,060 182,277 (50,689)
Accounts payable – related parties     (347) 121
Other payables 112,151 3,994 331,207 (301,711)
Other payables – related parties     (218) 182
Current provisions 1,465 52 (27,354) (27,803)
Current refund liabilities (16,136) (575) (6,627) (37,529)
Other current liabilities (11,183) (398) 1,442 (475)
Net defined benefit liability, non-current (20,446) (728) (19,742) (17,722)
Cash generated from operations 6,310,404 224,729 6,703,065 4,348,192
Interest received 32,817 1,169 67,105 48,590
Dividends received 23,229 827 20,585 6,184
Interest paid (150,135) (5,346) (171,149) (154,307)
Income tax paid (276,079) (9,832) (637,169) (119,473)
Net cash generated from operating activities 5,940,236 211,547 5,982,437 4,129,186
Cash flows from investing activities        
(Increase) decrease in financial assets at amortized cost (17,381) (619) 30,851 (198,030)
Proceeds from insurance compensation     10,435 147
Acquisition of investments accounted for using equity method       (794,694)
Proceeds from disposal of investment accounted for using equity method     1,180,179  
Acquisition of property, plant and equipment (3,961,026) (141,062) (5,440,621) (4,154,198)
Proceeds from disposal of property, plant and equipment 87,107 3,102 21,434 18,160
(Increase) decrease in refundable deposits (41) (1) 861 (664)
Increase in other non-current assets (10,919) (388) (45,480)  
Increase in long-term deferred revenue 85,909 3,059 4,500  
Proceeds from capital reduction of investment in associate 17,000 605    
Net cash used in investing activities (3,799,351) (135,304) (4,237,841) (5,129,279)
Cash flows from financing activities        
Proceeds from short-term bank loans 151,071 5,380 834,955 1,053,202
Payments on short-term bank loans (151,071) (5,380) (834,955) (2,022,555)
Payment on lease liabilities (84,928) (3,024) (48,161)  
Proceeds from long-term bank loans 4,429,593 157,749   12,663,550
Payments on long-term bank loans (5,756,450) (205,002) (756,450) (12,553,300)
(Decrease) increase in guarantee deposits 575 20 3 (279)
Cash dividend paid (1,309,032) (46,618) (872,718) (256,806)
Payments on capital reduction       (1,284,223)
Net cash used in financing activities (2,720,242) (96,875) (1,677,326) (2,400,411)
Net (decrease) increase in cash and cash equivalents (579,357) (20,632) 67,270 (3,400,504)
Effect of foreign exchange rate changes (11,076) (394) (5,708) 7,312
Cash and cash equivalents at beginning of year 4,704,084 167,524 4,642,522 8,035,714
Cash and cash equivalents at end of year $ 4,113,651 $ 146,498 $ 4,704,084 $ 4,642,522