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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 |  |

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