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Note 20 - Deferred Income Tax - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
At the beginning of the year $ 406,044 $ 549,619
Translation differences 783 (7,693)
Charged directly to other comprehensive income (1,361) 1,783
Income statement credit (charge) (101,028) (132,969)
Transfer to assets held for sale (4,696)
At the end of the year 304,438 406,044
Deferred tax assets, provisions and allowances [member]    
Statement Line Items [Line Items]    
At the beginning of the year (33,276) (32,425)
Translation differences (223) (3,123)
Charged directly to other comprehensive income
Income statement credit (charge) 7,024 2,272
Transfer to assets held for sale  
At the end of the year (26,475) (33,276)
Deferred tax assets, inventory [member]    
Statement Line Items [Line Items]    
At the beginning of the year (94,176) (107,378)
Translation differences (972) (1,347)
Charged directly to other comprehensive income
Income statement credit (charge) 5,593 14,274
Transfer to assets held for sale   275
At the end of the year (89,555) (94,176)
Deferred tax assets, tax loss [member]    
Statement Line Items [Line Items]    
At the beginning of the year (199,326) [1] (99,394)
Translation differences 322 [1] (2,741)
Charged directly to other comprehensive income [1]
Income statement credit (charge) (155,940) [1] (97,191)
Transfer to assets held for sale  
At the end of the year [1] (354,944) (199,326)
Deferred tax assets, other [member]    
Statement Line Items [Line Items]    
At the beginning of the year (81,838) (102,396)
Translation differences (606) 14
Charged directly to other comprehensive income (778) 1,823
Income statement credit (charge) 23,189 17,968
Transfer to assets held for sale   753
At the end of the year (60,033) (81,838)
Deferred tax assets [member]    
Statement Line Items [Line Items]    
At the beginning of the year (408,616) (341,593)
Translation differences (1,479) (7,197)
Charged directly to other comprehensive income (778) 1,823
Income statement credit (charge) (120,134) (62,677)
Transfer to assets held for sale   1,028
At the end of the year (531,007) (408,616)
Deferred tax liabilities, fixed assets [member]    
Statement Line Items [Line Items]    
At the beginning of the year 263,056 299,139
Translation differences 2,243 (540)
Charged directly to other comprehensive income
Income statement credit (charge) 207,605 (29,819)
Transfer to assets held for sale   (5,724)
At the end of the year 472,904 263,056
Deferred tax liabilities, inventory [member]    
Statement Line Items [Line Items]    
At the beginning of the year 36,891 42,516
Translation differences (2)
Charged directly to other comprehensive income
Income statement credit (charge) (1,955) (5,625)
Transfer to assets held for sale  
At the end of the year 34,934 36,891
Deferred tax liabilities, intangible and other assets [member]    
Statement Line Items [Line Items]    
At the beginning of the year [2] 514,713 549,557
Translation differences [2] 21 44
Charged directly to other comprehensive income [2] (583) (40)
Income statement credit (charge) [2] (186,544) (34,848)
Transfer to assets held for sale [2]  
At the end of the year [2] 327,607 514,713
Deferred tab liabilities [member]    
Statement Line Items [Line Items]    
At the beginning of the year 814,660 891,212
Translation differences 2,262 (496)
Charged directly to other comprehensive income (583) (40)
Income statement credit (charge) 19,106 (70,292)
Transfer to assets held for sale   (5,724)
At the end of the year $ 835,445 $ 814,660
[1] As of December 31, 2017, the net unrecognized deferred tax assets amount to $98.8 million.
[2] Includes the effect of currency translation on tax base (see Note 8).