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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
(Loss) income for the year $ (642,417) $ 731,258 $ 873,900
Adjustments for:      
Depreciation and amortization 678,806 539,521 664,357
Impairment charge 622,402
Income tax accruals less payments (117,214) (193,417) 58,494
Equity in earnings of non-consolidated companies (108,799) (82,036) (193,994)
Interest accruals less payments, net (538) (4,381) 6,151
Changes in provisions (13,175) 2,739 (8,396)
Changes in working capital 1,059,135 523,109 (737,952)
Currency translation adjustment and others 42,183 11,146 (51,758)
Net cash provided by operating activities 1,520,383 1,527,939 610,802
Cash flows from investing activities      
Capital expenditures (193,322) (350,174) (349,473)
Changes in advance to suppliers of property, plant and equipment (1,031) 3,820 4,851
Acquisition of subsidiaries, net of cash acquired (1,025,367) (132,845)
Investment in companies under cost method (2,933)
Additions to associated companies (19,610)
Loan to non-consolidated companies (14,740)
Repayment of loan by non-consolidated companies 40,470 9,370
Proceeds from disposal of property, plant and equipment and intangible assets 14,394 2,091 6,010
Dividends received from non-consolidated companies 278 28,974 25,722
Changes in investments in securities (887,216) 389,815 717,368
Net cash (used in) provided by investing activities (2,092,264) (40,392) 399,108
Cash flows from financing activities      
Dividends paid (82,637) (484,020) (484,020)
Dividends paid to non-controlling interest in subsidiaries (5,301) (1,872) (3,498)
Changes in non-controlling interests 2 1 (24)
Payments of lease liabilities (48,553) (41,530)
Proceeds from borrowings 658,156 1,332,716 1,019,302
Repayments of borrowings (896,986) (1,159,053) (1,432,202)
Net cash used in financing activities (375,319) (353,758) (900,442)
(Decrease) increase in cash and cash equivalents (947,200) 1,133,789 109,468
Movement in cash and cash equivalents      
At the beginning of the year 1,554,275 426,717 330,090
Effect of exchange rate changes (22,492) (6,231) (12,841)
(Decrease) increase in cash and cash equivalents (947,200) 1,133,789 109,468
At December 31, 584,583 1,554,275 426,717
Cash and cash equivalents:      
Cash and cash equivalents $ 1,554,275 $ 426,717 $ 426,717