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EMPLOYEE RELATED LIABILITIES (Schedule of Assets Measured at Fair Value) (Details) - Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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 23,235 19,871
Total assets measured at fair value 23,235 19,871
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