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Note 3 - Selling, General and Administrative Expenses - Components of Selling, General and Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Services and fees $ 132,301 $ 123,653 $ 158,541
Labor cost 443,338 441,355 579,360
Depreciation of property, plant and equipment 17,979 16,965 18,543
Amortization of intangible assets 188,550 241,238 238,539
Commissions, freight and other selling expenses 339,759 243,401 351,657
Provisions for contingencies 17,664 30,841 19,672
Allowances for doubtful accounts (5,421) (12,573) 36,788
Taxes 56,826 67,724 129,018
Other 81,061 76,563 92,157
1,272,057 1,229,167 1,624,275
From discontinued operations (2,041) (32,238) (30,678)
$ 1,270,016 $ 1,196,929 $ 1,593,597