EMPLOYEE BENEFIT PLANS (Details 4) (PLC, 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/(credit), and transition obligation for these plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost during 2014
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/(credit), and transition obligation for these plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost during 2014
Net actuarial loss	1,300
Prior service cost/(credit)	$ 12