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Note 1 - Segment Information - Geographical Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Net sales $ 5,288,504 $ 4,293,592 $ 6,903,123
Total assets 14,398,218 14,003,275  
Trade receivables, net 1,214,060 954,685  
Property, plant and equipment, net 6,229,143 6,001,939  
Capital expenditures 558,236 786,873 1,131,519
Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 5,288,504 4,293,592 6,903,123
Total assets 14,398,218 13,851,858 14,799,545
Trade receivables, net 1,214,060 954,685 1,107,189
Property, plant and equipment, net 6,229,143 6,001,939 5,626,602
Capital expenditures 558,092 784,962 1,130,313
Depreciation and amortization 608,640 657,109 653,313
Discontinued operations [member]      
Statement Line Items [Line Items]      
Net sales 11,899 234,911 197,630
Total assets 151,417 87,429
Trade receivables, net 33,620 27,940
Property, plant and equipment, net 41,470 45,656
Capital expenditures 145 1,911 1,206
Depreciation and amortization 5,303 5,465
North America [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 2,451,357 1,320,297 2,668,724
Total assets 7,925,520 7,467,842 8,625,806
Trade receivables, net 582,204 229,390 339,499
Property, plant and equipment, net 3,914,229 3,652,032 3,207,661
Capital expenditures 430,143 646,545 822,396
Depreciation and amortization 354,091 381,811 385,189
South America [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 1,142,142 1,210,527 2,132,221
Total assets 2,975,599 2,803,848 2,931,297
Trade receivables, net 234,877 204,746 396,834
Property, plant and equipment, net 1,190,145 1,237,391 1,269,995
Capital expenditures 58,949 59,780 168,140
Depreciation and amortization 126,273 128,458 125,754
Europe [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 545,777 565,173 728,815
Total assets 2,002,658 1,925,784 1,877,429
Trade receivables, net 214,944 161,291 181,084
Property, plant and equipment, net 878,788 847,318 907,466
Capital expenditures 57,285 35,270 82,344
Depreciation and amortization 93,900 113,875 112,742
Middle East and Africa [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 937,439 1,055,994 1,096,688
Total assets 391,029 593,649 429,317
Trade receivables, net 135,524 308,919 137,278
Property, plant and equipment, net 102,481 106,941 86,181
Capital expenditures 7,562 24,166 36,867
Depreciation and amortization 12,094 11,053 9,912
Asia Pacific [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales 211,789 141,601 276,675
Total assets 441,546 482,132 423,479
Trade receivables, net 46,511 50,339 52,494
Property, plant and equipment, net 143,500 158,257 155,299
Capital expenditures 4,153 19,201 20,566
Depreciation and amortization 22,282 21,912 19,716
Unallocated region [member] | Continuing operations [member]      
Statement Line Items [Line Items]      
Net sales
Total assets 661,866 578,603 512,217
Trade receivables, net
Property, plant and equipment, net
Capital expenditures
Depreciation and amortization