EMPLOYEE BENEFIT PLANS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period	$ 9,345	$ 9,145	$ 8,682
Interest cost on projected benefit obligation	8,985	8,977	8,938
Expected return on plan assets	(11,013)	(10,916)	(10,021)
Amortization of prior service cost/(credit)	(392)	(392)	(392)
Amortization of actuarial losses	9,631	7,749	5,625
Preliminary net periodic benefit cost	16,556	14,563	12,832
Total net periodic benefit cost	16,556	14,563	12,832
Average remaining service period used	8 years 2 months 8 days
Estimated net actuarial loss, prior service cost, and transition obligation for these plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost during 2013
Net actuarial loss	6,300
Prior service cost/(credit)	(392)
Unfunded Excess Benefits Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period	1,037	867	679
Interest cost on projected benefit obligation	1,387	1,473	1,506
Amortization of prior service cost/(credit)	12	12	12
Amortization of actuarial losses	1,792	1,300	881
Preliminary net periodic benefit cost	4,228	3,652	3,078
Settlement/curtailment expense	928
Total net periodic benefit cost	5,156	3,652	3,078
Average remaining service period used	7 years 5 months 12 days
Estimated net actuarial loss, prior service cost, and transition obligation for these plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost during 2013
Net actuarial loss	1,300
Prior service cost/(credit)	$ 12