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Note 1 - Segment Information - Geographical Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |
Net sales |  | $ 7,294,055 | $ 7,658,588 | $ 5,288,504
Total assets |  | 14,842,991 | 14,251,299 | 14,398,218
Current trade receivables |  | 1,348,160 | 1,737,366 | 1,214,060
Property, plant and equipment, net |  | 6,090,017 | 6,063,908 | 6,229,143
Capital expenditures |  | 350,174 | 349,473 | 558,236
Depreciation and amortization |  | 539,521 | 664,357 | 608,640
Discontinued operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  |  |  | 11,899
Total assets |  |  |  |
Current trade receivables |  |  |  |
Property, plant and equipment, net |  |  |  |
Capital expenditures |  |  |  | 145
Depreciation and amortization |  |  |  |
Continuing operations 1 [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Capital expenditures |  |  |  | 558,091
North America [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  | 3,429,911 | 3,611,509 | 2,451,357
Total assets |  | 7,885,120 | 7,971,311 | 7,925,520
Current trade receivables |  | 612,809 | 791,190 | 582,204
Property, plant and equipment, net |  | 3,771,570 | 3,859,060 | 3,914,229
Capital expenditures |  | 169,390 | 196,220 | 430,142
Depreciation and amortization |  | 276,046 | 441,705 | 354,091
South America [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  | 1,391,288 | 1,462,044 | 1,142,142
Total assets |  | 2,227,044 | 2,489,522 | 2,975,599
Current trade receivables |  | 176,173 | 280,801 | 234,877
Property, plant and equipment, net |  | 1,129,260 | 1,133,113 | 1,190,145
Capital expenditures |  | 113,999 | 68,603 | 58,949
Depreciation and amortization |  | 105,308 | 108,558 | 126,273
Europe [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  | 738,880 | 724,733 | 545,777
Total assets |  | 2,282,775 | 1,913,589 | 2,002,658
Current trade receivables |  | 149,321 | 215,202 | 214,944
Property, plant and equipment, net |  | 816,721 | 848,178 | 878,788
Capital expenditures |  | 55,169 | 77,467 | 57,285
Depreciation and amortization |  | 82,400 | 82,769 | 93,900
Middle East and Africa [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  | 1,382,172 | 1,559,988 | 937,439
Total assets |  | 958,424 | 588,746 | 391,029
Current trade receivables |  | 319,406 | 383,358 | 135,524
Property, plant and equipment, net |  | 254,858 | 94,040 | 102,481
Capital expenditures |  | 4,578 | 2,047 | 7,562
Depreciation and amortization |  | 42,520 | 10,389 | 12,094
Asia Pacific [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales |  | 351,804 | 300,314 | 211,789
Total assets |  | 609,663 | 482,563 | 441,546
Current trade receivables |  | 90,451 | 66,815 | 46,511
Property, plant and equipment, net |  | 117,608 | 129,517 | 143,500
Capital expenditures |  | 7,038 | 5,136 | 4,153
Depreciation and amortization |  | 33,247 | 20,936 | 22,282
Unallocated region [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Net sales | [1] |  |  |
Total assets | [1] | 879,965 | 805,568 | 661,866
Current trade receivables | [1] |  |  |
Property, plant and equipment, net | [1] |  |  |
Capital expenditures | [1] |  |  |
Depreciation and amortization | [1] |  |  |
[1] | For 2019 and 2018 includes Investments in non-consolidated companies, for 2017 includes Investments in non-consolidated companies and Other equity investments for $21.6 million. See Note 12 and 33.

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