EMPLOYEE BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,134	$ 3,699	$ 14,276	$ 11,096
Interest cost	616	248	1,787	744
Expected return on plan assets	(546)	(138)	(1,609)	(414)
Amortization of prior service costs	13	3	26	9
Amortization of loss	277	105	757	315
Net periodic benefit cost	5,494	3,917	15,237	11,750
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	269	181	747	544
Interest cost	125	84	353	251
Amortization of prior service costs	52	0	107	0
Amortization of loss	0	0	(4)	0
Net periodic benefit cost	$ 446	$ 265	$ 1,203	$ 795