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Consolidated Statements of Cash Flows
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Cash flows from operating activities        
Profit before income tax $ 6,035,585 $ 217,577 $ 2,973,359 $ 3,022,253
Adjustments to reconcile profit (loss)        
Depreciation expenses 4,634,112 167,055 4,175,519 3,731,914
(Reversal of) expected credit losses 299 11 264 (806)
Interest expense 120,998 4,362 162,400 171,075
Interest income (9,980) (360) (27,778) (64,368)
Dividend income (4,690) (169) (3,229) (585)
Share-based payments       822
Share of loss (profit) of associates and joint ventures accounted for using equity method (625,733) (22,557) 147,329 154,926
Gain on valuation of financial assets at fair value through profit or loss (15,262) (550) (24,015) (1,317)
Gain on disposal of property, plant and equipment, net (33,935) (1,223) (48,070) (20,271)
Insurance compensation income       (10,435)
Gain from lease modification (891) (32)    
Impairment loss on property, plant and equipment 4,843 174   9,938
Gain on disposal of investment accounted for using equity method       (973,609)
Deferred revenue (12,389) (447) (10,143) (12,279)
Financial assets at fair value through profit or loss (290,637) (10,477) (28,435) 1,750
Current contract assets (11,242) (405) (11,150) (78,013)
Accounts and notes receivable (980,816) (35,357) (911,355) 294,409
Accounts receivable – related parties     1,045 (905)
Other receivables (46,089) (1,661) 13,529 (8,082)
Other receivables – related parties     4,923 12,437
Inventories (1,105,102) (39,838) (334,433) 11,193
Prepayments (67,401) (2,430) (10,485) (4,333)
Other non-current assets 6,915 249 6,337 6,914
Current contract liabilities     (1,231) (201)
Accounts and notes payable 42,694 1,539 170,172 182,277
Accounts payable – related parties       (347)
Other payables 471,766 17,007 112,151 331,207
Other payables – related parties       (218)
Current provisions 818 29 1,465 (27,354)
Current refund liabilities (15) (1) (16,136) (6,627)
Other current liabilities (6,838) (247) (11,183) 1,442
Net defined benefit liability, non-current (23,362) (842) (20,446) (19,742)
Cash generated from operations 8,083,648 291,407 6,310,404 6,703,065
Interest received 10,344 373 32,817 67,105
Dividends received 17,140 618 23,229 20,585
Interest paid (99,857) (3,600) (150,135) (171,149)
Income tax paid (691,566) (24,930) (276,079) (637,169)
Net cash generated from operating activities 7,319,709 263,868 5,940,236 5,982,437
Cash flows from investing activities        
Decrease (increase) in financial assets at amortized cost 188,023 6,778 (17,381) 30,851
Proceeds from insurance compensation       10,435
Proceeds from disposal of investment accounted for using equity method       1,180,179
Proceeds from disposal of financial assets at fair value through profit or loss 9,427 340    
Acquisition of property, plant and equipment (5,881,506) (212,023) (3,961,026) (5,440,621)
Proceeds from disposal of property, plant and equipment 120,586 4,347 87,107 21,434
Decrease (increase) in refundable deposits (92) (3) (41) 861
Increase in other non-current assets (501,177) (18,066) (10,919) (45,480)
Increase in long-term deferred revenue 49,349 1,779 85,909 4,500
Proceeds from capital reduction of investment in associate     17,000  
Net cash used in investing activities (6,015,390) (216,848) (3,799,351) (4,237,841)
Cash flows from financing activities        
Proceeds from short-term bank loans 2,195,726 79,154 151,071 834,955
Payments on short-term bank loans (1,463,975) (52,775) (151,071) (834,955)
Payment on lease liabilities (289,668) (10,442) (84,928) (48,161)
Proceeds from long-term bank loans 4,908,782 176,957 4,429,593  
Payments on long-term bank loans (3,256,450) (117,392) (5,756,450) (756,450)
Increase (decrease) in guarantee deposits (45) (2) 575 3
Cash dividend paid (1,599,928) (57,676) (1,309,032) (872,718)
Net cash (used in) generated from financing activities 494,442 17,824 (2,720,242) (1,677,326)
Net increase (decrease) in cash and cash equivalents 1,798,761 64,844 (579,357) 67,270
Effect of foreign exchange rate changes (6,236) (225) (11,076) (5,708)
Cash and cash equivalents at beginning of year 4,113,651 148,293 4,704,084 4,642,522
Cash and cash equivalents at end of year $ 5,906,176 $ 212,912 $ 4,113,651 $ 4,704,084