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Consolidated Statements of Cash Flows
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Profit before income tax $ 1,043,374 $ 31,937,678 $ 31,020,663 $ 27,968,705
Adjustments for:        
Depreciation expense 1,316,121 40,286,453 28,747,518 28,961,614
Amortization expense 78,486 2,402,450 457,666 508,823
Net loss (gain) on fair value change of financial assets and liabilities at fair value through profit or loss (64,995) (1,989,490) 2,783,902 (447,559)
Finance costs 116,571 3,568,241 1,799,494 2,261,075
Interest income (15,231) (466,211) (306,871) (230,067)
Dividend income (6,220) (190,397) (59,039) (26,411)
Compensation cost of employee share options 7,045 215,648 438,765 470,788
Share of loss (profit) of associates and joint ventures 15,689 480,244 (525,782) (1,503,910)
Loss (gain) on disposal of property, plant and equipment 1,859 56,902 (348,070) 131,044
Impairment loss recognized on financial assets 22,072 675,624 77,101 91,886
Reversal of impairment loss recognized on financial assets       (28,022)
Impairment loss recognized on non- financial assets 36,393 1,113,998 1,113,499 1,340,011
Reversal of impairment loss recognized on non-financial assets (3,267) (100,000)    
Gain on disposal of subsidiaries     (5,589,457)  
Gain on remeasurement of investments accounted for using the equity method (242,451) (7,421,408)    
Net loss (gain) on foreign currency exchange 44,442 1,360,380 (2,356,480) (407,160)
Others 37,332 1,142,735 1,172,005 900,378
Financial assets held for trading     (226,049) 1,052,111
Financial assets mandatorily at fair value through profit or loss 11,288 345,540    
Contract assets (16,601) (508,166)    
Trade receivables (304,265) (9,313,539) (4,066,374) (6,184,873)
Other receivables 14,489 443,517 (330,491) (211,755)
Inventories (302,179) (9,249,714) (2,907,848) 3,156,759
Other current assets (12,583) (385,172) (781,477) (24,517)
Financial liabilities held for trading (66,637) (2,039,771) (3,874,662) (2,952,116)
Trade payables 228,331 6,989,198 4,753,270 1,665,420
Other payables 33,203 1,016,338 685,398 1,380,205
Other current liabilities 7,455 228,190 211,145 (2,347,599)
Other operating activities items (9,204) (281,736) 27,538 (407,143)
Cash generated from operations 1,970,517 60,317,532 51,915,364 55,117,687
Interest received 17,108 523,679 236,746 228,509
Dividend received 9,731 297,882 1,929,218 4,043,644
Interest paid (105,820) (3,239,159) (1,666,759) (2,043,870)
Income tax paid (222,974) (6,825,243) (4,983,769) (5,238,103)
Net cash generated from operating activities 1,668,562 51,074,691 47,430,800 52,107,867
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of financial assets at fair value through other comprehensive income (3,430) (105,000)    
Proceeds on sale of financial assets at fair value through other comprehensive income 3,078 94,217    
Return of capital from financial assets at fair value through other comprehensive income 3,799 116,278    
Purchase of financial assets designated as at fair value through profit or loss     (61,308,095) (64,853,336)
Proceeds on sale of financial assets designated as at fair value through profit or loss     61,601,865 66,472,870
Purchase of available-for-sale financial assets     (902,648) (1,590,928)
Proceeds on sale of available-for-sale financial assets     1,121,517 867,336
Cash received from return of capital by available-for-sale financial assets     16,175 28,927
Acquisition of associates and joint ventures (14,752) (451,563)   (16,041,463)
Net cash outflow on acquisition of subsidiaries (3,111,462) (95,241,855)   (73,437)
Cash received from return of capital by investee accounted for using the equity method 8,590 262,941    
Net cash inflow from disposal of subsidiaries     7,020,883  
Payments for property, plant and equipment (1,352,057) (41,386,443) (24,699,240) (26,714,163)
Proceeds from disposal of property, plant and equipment 36,839 1,127,644 1,488,210 670,200
Payments for intangible assets (18,875) (577,765) (337,984) (513,893)
Proceeds from disposal of intangible assets     34,690 25,646
Payments for investment properties (4,109) (125,764) (186,522)  
Decrease (increase) in other financial assets 202,827 6,208,527 236,227 (1,231,186)
Increase in other non-current assets (64,383) (1,970,772) (171,320) (206,031)
Proceeds from financial liabilities for hedging 81,909 2,507,233    
Net cash used in investing activities (4,232,026) (129,542,322) (16,086,242) (43,159,458)
CASH FLOWS FROM FINANCING ACTIVITIES        
Net proceeds from (repayment of) short-term borrowings borrowings 729,429 22,327,813 (2,038,993) (10,640,229)
Net repayment of short-term bills payable       (4,348,054)
Proceeds from issue of bonds     8,000,000 9,000,000
Repayment of bonds payable (202,078) (6,185,600) (9,123,972) (10,365,135)
Proceeds from long-term borrowings 6,525,436 199,743,582 35,394,158 62,282,917
Repayment of long-term borrowings (3,731,873) (114,232,623) (51,867,539) (52,924,902)
Dividends paid (346,737) (10,613,626) (11,214,221) (12,243,766)
Proceeds from issue of ordinary shares     10,290,000  
Proceeds from exercise of employee share options 41,479 1,269,680 1,439,819 995,832
Payments for buy-back of ordinary shares (2,329) (71,302)    
Proceeds from disposal of interests in subsidiaries 91,721 2,807,568    
Decrease in non-controlling interests (386,156) (11,820,227) (246,440) (3,063,623)
Other financing activities items (3,720) (113,859) 43,761 219,940
Net cash generated from (used in) financing activities 2,715,172 83,111,406 (19,323,427) (21,087,020)
EFFECTS OF EXCHANGE RATE CHANGES ON THE BALANCE OF CASH AND CASH EQUIVALENTS HELD IN FOREIGN CURRENCY 26,024 796,595 (4,335,589) (4,720,046)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 177,732 5,440,370 7,685,542 (16,858,657)
CASH AND CASH EQUIVALENTS AT THE BEGINNING OF THE YEAR 1,505,327 46,078,066 38,392,524 55,251,181
CASH AND CASH EQUIVALENTS AT THE END OF THE YEAR $ 1,683,059 $ 51,518,436 $ 46,078,066 $ 38,392,524