EMPLOYEE BENEFIT PLANS (Pre-tax Amounts in AOCI Not Yet Recognized as Components of Net Periodic Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (costs) credits	$ (582)	$ (92)
Net actuarial (loss) gain	(23,762)	(16,419)
Total	(24,344)	(16,511)
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (costs) credits	(2,793)	860
Net actuarial (loss) gain	(78)	1,126
Total	$ (2,871)	$ 1,986