EMPLOYEE BENEFIT PLANS (Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14,794	$ 11,437	$ 8,678
Interest cost	992	502	140
Expected return on plan assets	(550)	(323)	(38)
Amortization of prior service costs	11	11	11
Amortization of loss	421	30	56
Net periodic benefit cost	15,668	11,657	8,847
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	726	633	540
Interest cost	334	395	381
Expected return on plan assets	0	0	0
Amortization of prior service costs	0	0	0
Amortization of loss	0	0	0
Net periodic benefit cost	$ 1,060	$ 1,028	$ 921