INCOME TAXES (Deferred Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred Income Tax Expense Benefit Net Resulting from Tax Reform Act	$ 329	$ 14,532
Income Tax Reconciliation Foreign Withholding Taxes	(4,424)	6,667	$ 0
Deferred tax assets:
Tax loss and credit carry-forwards	60,756	60,454
Inventory	3,544	2,501
Other accruals	13,172	14,873
Employee benefits	22,963	18,468
Pension obligations	12,122	12,363
Other	3,739	4,923
Deferred tax assets, gross	116,296	113,582
Valuation allowance	(69,400)	(68,694)
Deferred tax assets, net	46,896	44,888
Deferred tax liabilities:
Property, plant and equipment	28,606	21,427
Intangible assets	10,950	10,729
Inventory	4,814	5,891
Pension obligations	19,346	16,137
Other	8,770	15,483
Deferred tax liabilities	72,486	69,667
Total deferred taxes	(25,590)	$ (24,779)
Tax loss carryforwards of certain subsidiaries that will expire in various years from 2019 through 2034	61,931
Tax loss carryforwards of certain subsidiaries for which there is no expiration date	214,438
Foreign Withholding Taxes Liability	$ 2,243