EMPLOYEE BENEFIT PLANS (Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	$ 30,215	$ 11,409
Service cost	14,794	11,437	8,678
Interest cost	992	502	140
Plan amendments	0	0
Benefit payments	(663)	(48)
Actuarial loss (gain)	8,012	6,916
Projected benefit obligation at end of year	53,350	30,215	11,409
Change in plan assets:
Fair value of plan assets at beginning of year	10,232	4,758
Actual return on plan assets	33	422
Benefits paid	(663)	(48)
Employer contributions	15,448	5,100
Fair value of plan assets at end of year	25,050	10,232	4,758
Reconciliation of funded status:
Fair value of plan assets at end of year	25,050	10,232	4,758
Less benefit obligation at end of year	53,350	30,215	11,409
Funded status at end of year	(28,300)	(19,983)
Post Retirement Medical Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	9,730	8,912
Service cost	726	633	540
Interest cost	334	395	381
Plan amendments	(860)	0
Benefit payments	(51)	(21)
Actuarial loss (gain)	(1,654)	(189)
Projected benefit obligation at end of year	8,225	9,730	8,912
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Benefits paid	(51)	(21)
Employer contributions	51	21
Fair value of plan assets at end of year	0	0	0
Reconciliation of funded status:
Fair value of plan assets at end of year	0	0	0
Less benefit obligation at end of year	8,225	9,730	8,912
Funded status at end of year	$ (8,225)	$ (9,730)