EMPLOYEE RELATED LIABILITIES (Schedule of Amounts Recognized in Statement of Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Postretirement Medical Plan [Member]
Amounts recognized in statement of financial position:
Non-current assets
Current liabilities	(83)	(89)	(132)
Non-current liabilities	(2,894)	(2,228)	(2,863)
Net amount recognized	(2,977)	(2,317)	(2,995)
Weighted average assumptions used:
Discount rate	4.30%	5.20%	4.30%
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	7.00%	7.75%	8.25%
Ultimate rate	5.00%	5.00%	5.00%
Ultimate rate	4.50%	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	20.00%	25.00%	35.00%
Ultimate rate	5.00%	5.00%	5.00%
Ultimate rate			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
Current liabilities
Non-current liabilities	(1,170)		(4,729)
Net amount recognized	(1,170)	779	(4,729)
Weighted average assumptions used:
Discount rate	4.20%	5.10%	4.30%
Rate of compensation increases

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

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Represents the ultimate trend rate, one for health care costs.

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

+ References

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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

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- Definition

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

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- Definition

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.

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-Glossary Health Care Cost Trend Rate

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The ultimate trend rate for health care costs.

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