EMPLOYEE RELATED LIABILITIES (Schedule of Amounts Recognized in Statement of Financial Position) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Postretirement Medical Plan [Member]
Amounts recognized in statement of financial position:
Current liabilities	$ (40)	$ (83)	$ (89)
Non-current liabilities	(1,741)	(2,894)	(2,228)
Net amount recognized	$ (1,781)	$ (2,977)	$ (2,317)
Weighted average assumptions used:
Discount rate	4.80%	4.30%	5.20%
Rate of compensation increases
Postretirement Medical Plan [Member] \| Pre 65 [Member]
Assumed health care cost trend rates:
Health care cost trend rate assumed for next year	6.75%	7.00%	7.75%
Ultimate rate	4.50%	5.00%	5.00%
Year the ultimate rate is reached	2025	2022	2022
Postretirement Medical Plan [Member] \| Post 65 [Member]
Assumed health care cost trend rates:
Health care cost trend rate assumed for next year	10.00%	20.00%	25.00%
Ultimate rate	5.00%	5.00%	5.00%
Year the ultimate rate is reached	2022	2022	2022
Pension Plan [Member]
Amounts recognized in statement of financial position:
Non-current assets			$ 779
Non-current liabilities	$ (79)	$ (1,170)
Net amount recognized	$ (79)	$ (1,170)	$ 779
Weighted average assumptions used:
Discount rate	4.60%	4.20%	5.10%
Rate of compensation increases

This represents the current liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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