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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Profit for the year $ 235,467 $ 433,935 $ 45,160
Adjustments for:      
Depreciation and amortization 21,342 21,342 23,596
Reversal of credit losses recognized on accounts receivable 0 (190) 0
Gain on disposal of subsidiary (10,694) 0 0
Share-based compensation expenses 3,096 700 763
Gains on disposal of property, plant and equipment, net 0 (147) (244)
Changes in fair value of financial assets at fair value through profit or loss (1,246) 284 (472)
Interest income (4,813) (876) (967)
Finance costs 2,783 1,074 1,705
Income tax expense 41,098 110,657 11,712
Share of losses of associates 743 1,392 638
Inventories write downs 22,211 9,448 11,919
Unrealized foreign currency exchange gains (2,883) (953) (239)
cash flows from operating activities before changes in operating Capital 307,104 576,666 93,571
Changes in:      
Accounts receivable (including related parties) 146,870 (166,395) (78,297)
Inventories (194,544) (99,341) 24,772
Other receivable from related parties (7) (17) 0
Other current assets 10,099 (7,633) (2,881)
Other non-current assets 0 (19,460) 0
Accounts payable (including related parties) (124,870) 74,954 57,335
Other payable to related parties 927 (931) 352
Contract liabilities 1,283 41,262 4,720
Other current liabilities 1,831 13,736 1,134
Other non-current liabilities 3,972 (4,697) 5,350
Cash generated from operating activities 152,665 408,144 106,056
Interest received 4,525 852 1,066
Interest paid (2,783) (1,074) (1,811)
Income tax paid (71,499) (19,646) (2,701)
Net cash provided by operating activities 82,908 388,276 102,610
Cash flows from investing activities:      
Acquisitions of property, plant and equipment (11,797) (7,562) (5,786)
Proceeds from disposal of property, plant and equipment 0 0 249
Acquisitions of intangible assets (331) (468) (87)
Acquisitions of financial assets at amortized cost (8,763) (25,362) (3,829)
Proceeds from disposal of financial assets at amortized cost 25,823 8,011 6,735
Acquisitions of financial assets at fair value through profit or loss (108,374) (23,417) (19,743)
Proceeds from disposal of financial assets at fair value through profit or loss 110,283 29,141 12,068
Proceeds from disposal of subsidiary 14,769 0 0
Proceeds from disposal of financial assets at fair value through other comprehensive income 96 0 0
Acquisition of a subsidiary, net of cash acquired 0 0 1,302
Proceeds from capital reduction of investment 0 151 32
Acquisitions of equity method investments (3,264) (598) (792)
Increase in refundable deposits (6,144) (213,056) (13,992)
Releases (pledges) of restricted deposit 2,700 (2,595) (8)
Cash received in advance from disposal of land 0 3,075 1,486
Net cash provided by (used in) investing activities 14,998 (232,680) (22,365)
Cash flows from financing activities:      
Payments of cash dividends (217,873) (47,424) (4)
Proceeds from issuance of new shares by subsidiaries 487 0 884
Purchases of subsidiary shares from noncontrolling interests (301) (1,627) 0
Proceeds from short-term unsecured borrowings 0 15,000 208,137
Repayments of short-term unsecured borrowings 0 (15,000) (265,355)
Proceeds from long-term unsecured borrowings 40,000 0 60,000
Repayments of long-term unsecured borrowings (46,000) (6,000) (1,500)
Proceeds from short-term secured borrowings 1,212,700 611,600 278,000
Repayments of short-term secured borrowings (994,800) (564,200) (338,000)
Release (pledge) of restricted deposit (217,900) (47,400) 60,000
Payment of lease liabilities (4,294) (4,668) (2,608)
Guarantee deposits received 16,913 54,050 0
Proceeds from exercise of employee stock options 0 1,182 3,707
Net cash provided by (used in) financing activities (211,068) (4,487) 3,261
Effect of foreign currency exchange rate changes on cash and cash equivalents (1,281) (23) 377
Net increase (decrease) in cash and cash equivalents (114,443) 151,086 83,883
Cash and cash equivalents at beginning of year 336,024 184,938 101,055
Cash and cash equivalents at end of year $ 221,581 $ 336,024 $ 184,938