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INCOME TAXES (Deferred Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income Tax Reconciliation Foreign Withholding Taxes $ 6,667 $ 0 $ 0
Deferred tax assets:      
Tax loss and credit carry-forwards 65,284 52,270  
Inventory 2,501 2,080  
Other accruals 14,873 18,186  
Employee benefits 18,468 23,596  
Pension obligations 12,363 2,503  
Other 4,923 3,020  
Deferred tax assets, gross 118,412 101,655  
Valuation allowance (68,694) (47,849)  
Deferred tax assets, net 49,718 53,806  
Deferred tax liabilities:      
Property, plant and equipment 21,427 32,210  
Intangible assets 10,729 17,506  
Inventory 5,891 10,059  
Pension obligations 16,137 17,915  
Other 20,313 9,309  
Deferred tax liabilities 74,497 86,999  
Total deferred taxes (24,779) $ (33,193)  
Tax loss carryforwards of certain subsidiaries that will expire in various years from 2018 through 2033 80,961    
Tax loss carryforwards of certain subsidiaries for which there is no expiration date $ 177,796