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Consolidated Statements of Cash Flows
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Profit before income tax $ 31,020,663 $ 1,046,581 $ 27,968,705 $ 25,011,788
Adjustments for:        
Depreciation expense 28,747,518 969,890 28,961,614 28,938,770
Amortization expense 457,666 15,441 508,823 579,894
Net loss (gain) on fair value change of financial assets and liabilities at fair value through profit or loss 2,783,902 93,924 (447,559) (2,472,835)
Finance costs 1,799,494 60,712 2,261,075 2,312,143
Interest income (306,871) (10,353) (230,067) (242,084)
Dividend income (59,039) (1,992) (26,411) (396,973)
Compensation cost of employee share options 438,765 14,803 470,788 133,496
Share of profit of associates and joint ventures (525,782) (17,739) (1,503,910) (126,265)
Loss (gain) on disposal of property, plant and equipment (348,070) (11,743) 131,044 126,132
Impairment loss recognized on financial assets 77,101 2,601 91,886 8,232
Reversal of impairment loss on financial assets     (28,022)  
Impairment loss recognized on non- financial assets 1,113,499 37,568 1,340,011 610,140
Gain on disposal of subsidiaries (5,589,457) (188,578)    
Net loss (gain) on foreign currency exchange (2,356,480) (79,503) (407,160) 1,358,777
Others 1,172,005 39,541 900,378 1,242,110
Financial assets held for trading (226,049) (7,626) 1,052,111 4,162,522
Trade receivables (4,066,374) (137,192) (6,184,873) 7,982,736
Other receivables (330,491) (11,150) (211,755) 55,112
Inventories (2,907,848) (98,106) 3,156,759 (5,128,726)
Other current assets (781,477) (26,366) (24,517) 407,017
Financial liabilities held for trading (3,874,662) (130,724) (2,952,116) (1,725,606)
Trade payables 4,753,270 160,367 1,665,420 (1,272,717)
Other payables 685,398 23,124 1,380,205 (814,809)
Other current liabilities 211,145 7,124 (2,347,599) 2,545,312
Other operating activities items 27,538 929 (407,143) (247,024)
Cash generated from operations 51,915,364 1,751,533 55,117,687 63,047,142
Interest received 236,746 7,987 228,509 253,289
Dividend received 1,929,218 65,088 4,043,644 499,918
Interest paid (1,666,759) (56,234) (2,043,870) (2,067,955)
Income tax paid (4,983,769) (168,144) (5,238,103) (4,184,089)
Net cash generated from operating activities 47,430,800 1,600,230 52,107,867 57,548,305
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of financial assets designated as at fair value through profit or loss (61,308,095) (2,068,424) (64,853,336) (100,842,813)
Proceeds on sale of financial assets designated as at fair value through profit or loss 61,601,865 2,078,335 66,472,870 102,139,161
Purchase of available-for-sale financial assets (902,648) (30,454) (1,590,928) (1,273,510)
Proceeds on sale of available-for-sale financial assets 1,121,517 37,838 867,336 2,761,145
Cash received from return of capital by available-for-sale financial assets 16,175 546 28,927 44,511
Acquisition of associates and joint ventures     (16,041,463) (35,673,097)
Net cash outflow on acquisition of subsidiaries     (73,437)  
Net cash inflow from disposal of subsidiaries 7,020,883 236,872    
Payments for property, plant and equipment (24,699,240) (833,308) (26,714,163) (30,280,124)
Proceeds from disposal of property, plant and equipment 1,488,210 50,210 670,200 243,031
Payments for intangible assets (337,984) (11,403) (513,893) (491,135)
Proceeds from disposal of intangible assets 34,690 1,170 25,646  
Payments for investment properties (186,522) (6,293)    
Decrease (increase) in other financial assets 236,227 7,970 (1,231,186) 358,266
Increase in other non-current assets (171,320) (5,780) (206,031) (336,864)
Net cash used in investing activities (16,086,242) (542,721) (43,159,458) (63,351,429)
CASH FLOWS FROM FINANCING ACTIVITIES        
Net repayment of short-term borrowings (2,038,993) (68,792) (10,640,229) (8,532,792)
Net proceeds from (repayment of) short-term bills payable     (4,348,054) 4,348,054
Proceeds from issue of bonds 8,000,000 269,906 9,000,000 6,136,425
Repayment of bonds payable (9,123,972) (307,826) (10,365,135)  
Proceeds from long-term borrowings 35,394,158 1,194,135 62,282,917 39,887,570
Repayment of long-term borrowings (51,867,539) (1,749,917) (52,924,902) (22,926,660)
Dividends paid (11,214,221) (378,348) (12,243,766) (15,297,474)
Proceeds from issue of ordinary shares 10,290,000 347,166    
Proceeds from exercise of employee share options 1,439,819 48,577 995,832 1,285,102
Payments for acquisition of treasury shares       (5,333,406)
Proceeds from partial disposal of interests in subsidiaries       8,910,346
Decrease in non-controlling interests (246,440) (8,314) (3,063,623) (232,148)
Other financing activities items 43,761 1,476 219,940 391,322
Net cash generated from (used in) financing activities (19,323,427) (651,937) (21,087,020) 8,636,339
EFFECTS OF EXCHANGE RATE CHANGES ON THE BALANCE OF CASH AND CASH EQUIVALENTS HELD IN FOREIGN CURRENCY (4,335,589) (146,275) (4,720,046) 723,556
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 7,685,542 259,297 (16,858,657) 3,556,771
CASH AND CASH EQUIVALENTS AT THE BEGINNING OF THE YEAR 38,392,524 1,295,294 55,251,181 51,694,410
CASH AND CASH EQUIVALENTS AT THE END OF THE YEAR $ 46,078,066 $ 1,554,591 $ 38,392,524 $ 55,251,181