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EMPLOYEE RELATED LIABILITIES (Schedule of Assets Measured at Fair Value) (Details) - Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in mutual funds |  |
Total assets measured at fair value |  |
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in mutual funds | 22,669 | 23,235
Total assets measured at fair value | 22,669 | 23,235
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in mutual funds |  |
Total assets measured at fair value |  |

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