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Note 1 - Segment Information - Geographical Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Net sales $ 5,146,734 $ 7,294,055 $ 7,658,588
Total assets 13,716,189 14,842,991 14,251,299
Trade receivables 968,148 1,348,160 1,737,366
Property, plant and equipment, net 6,193,181 6,090,017 6,063,908
Capital expenditures 193,322 350,174 349,473
Depreciation and amortization 678,806 539,521 664,357
North America [member]      
Disclosure of operating segments [line items]      
Net sales 2,179,949 3,429,911 3,611,509
Total assets 8,071,574 7,885,120 7,971,311
Trade receivables 411,692 612,809 791,190
Property, plant and equipment, net 3,971,101 3,771,570 3,859,060
Capital expenditures 71,531 169,390 196,220
Depreciation and amortization 408,546 276,046 441,705
South America [member]      
Disclosure of operating segments [line items]      
Net sales 776,235 1,391,288 1,462,044
Total assets 1,868,458 2,227,044 2,489,522
Trade receivables 115,972 176,173 280,801
Property, plant and equipment, net 1,050,619 1,129,260 1,133,113
Capital expenditures 63,111 113,999 68,603
Depreciation and amortization 106,827 105,308 108,558
Europe [member]      
Disclosure of operating segments [line items]      
Net sales 642,793 738,880 724,733
Total assets 1,461,738 2,282,775 1,913,589
Trade receivables 139,427 149,321 215,202
Property, plant and equipment, net 823,057 816,721 848,178
Capital expenditures 39,691 55,169 77,467
Depreciation and amortization 84,518 82,400 82,769
Middle East and Africa [member]      
Disclosure of operating segments [line items]      
Net sales 1,227,532 1,382,172 1,559,988
Total assets 804,559 958,424 588,746
Trade receivables 210,194 319,406 383,358
Property, plant and equipment, net 242,939 254,858 94,040
Capital expenditures 10,452 4,578 2,047
Depreciation and amortization 44,259 42,520 10,389
Asia Pacific [member]      
Disclosure of operating segments [line items]      
Net sales 320,225 351,804 300,314
Total assets 552,508 609,663 482,563
Trade receivables 90,863 90,451 66,815
Property, plant and equipment, net 105,465 117,608 129,517
Capital expenditures 8,537 7,038 5,136
Depreciation and amortization 34,656 33,247 20,936
Unallocated [member]      
Disclosure of operating segments [line items]      
Net sales
Total assets [1] 957,352 879,965 805,568
Trade receivables
Property, plant and equipment, net
Capital expenditures
Depreciation and amortization
[1] For 2020, 2019 and 2018 includes Investments in non-consolidated companies. See note 13.