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INCOME TAXES (Deferred Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INCOME TAXES      
Income Tax Reconciliation Foreign Withholding Taxes $ 0 $ 0 $ (4,424)
Deferred tax assets:      
Tax loss and credit carry-forwards 56,076 64,712  
Inventory 2,525 3,442  
Other accruals 14,084 13,048  
Employee benefits 27,673 24,532  
Pension obligations 13,021 11,561  
Other 4,306 3,401  
Deferred tax assets, gross 117,685 120,696  
Valuation allowance (65,413) (71,546)  
Deferred tax assets, net 52,272 49,150  
Deferred tax liabilities:      
Property, plant and equipment 36,795 39,583  
Intangible assets 13,595 16,695  
Inventory 5,586 6,427  
Pension obligations 16,070 25,171  
Other 10,009 11,285  
Deferred tax liabilities 82,055 99,161  
Total deferred taxes (29,783) $ (50,011)  
Tax loss carryforwards of certain subsidiaries that will expire in various years from 2020 through 2035 42,824    
Tax loss carryforwards of certain subsidiaries for which there is no expiration date 174,993    
Foreign Withholding Taxes Liability $ 1,786