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Note 4 - Labor Costs - Summary of Labor Costs (Included in Cost of Sales and in Selling, General and Administrative Expenses) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Statement Line Items [Line Items]      
Wages, salaries and social security costs $ 1,144,341 $ 988,794 $ 1,327,968
Severance indemnities 34,497 73,741 176,950
Defined contribution plans 12,401 10,758 13,286
Pension benefits - defined benefit plans 15,066 10,563 14,813
Employee retention and long term incentive program 15,441 16,474 (5,660)
1,221,746 1,100,330 1,527,357
From discontinued operations (853) (28,306) (24,665)
$ 1,220,893 $ 1,072,024 $ 1,502,692
Number of employees 21,605 19,399 21,741
Discontinued operations [member]      
Statement Line Items [Line Items]      
Number of employees 323 292
Continuing operations [member]      
Statement Line Items [Line Items]      
Number of employees 21,605 19,076 21,449
ARGENTINA      
Statement Line Items [Line Items]      
Number of employees 5,221 4,755 5,388
MEXICO      
Statement Line Items [Line Items]      
Number of employees 5,139 4,968 5,101
BRAZIL      
Statement Line Items [Line Items]      
Number of employees 1,382 1,166 2,050
UNITED STATES      
Statement Line Items [Line Items]      
Number of employees 1,953 1,636 2,190
ITALY      
Statement Line Items [Line Items]      
Number of employees 2,088 1,979 2,030
ROMANIA      
Statement Line Items [Line Items]      
Number of employees 1,870 1,631 1,624
CANADA      
Statement Line Items [Line Items]      
Number of employees 919 473 546
INDONESIA      
Statement Line Items [Line Items]      
Number of employees 506 509 532
COLOMBIA      
Statement Line Items [Line Items]      
Number of employees 1,003 750 636
JAPAN      
Statement Line Items [Line Items]      
Number of employees 410 458 508
Other geographical areas [member]      
Statement Line Items [Line Items]      
Number of employees 1,114 1,074 1,136