EMPLOYEE BENEFIT PLANS (Pre-tax Amounts Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service costs (credits)	$ 529	$ 0	$ 0
Net actuarial loss (gain)	8,151	8,235	6,817
Amortization of loss	(1,072)	(432)	(41)
Total changes in other comprehensive loss (income)	7,608	7,803	6,776
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service costs (credits)	3,911	(860)	0
Net actuarial loss (gain)	1,201	(1,654)	(189)
Amortization of loss	(255)	0	0
Total changes in other comprehensive loss (income)	$ 4,857	$ (2,514)	$ (189)