EMPLOYEE BENEFIT PLANS (Pre-tax Amounts in AOCI to be Recognized Over Next Fiscal Year) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service (costs) credits	$ (86)
Amortization of net actuarial (loss) gain	(285)
Total	(371)
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service (costs) credits	646
Amortization of net actuarial (loss) gain	0
Total	$ 646

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration